{"api_version":"1","generated_at":"2026-08-04T23:05:31+00:00","cve":"CVE-2024-35932","urls":{"html":"https://cve.report/CVE-2024-35932","api":"https://cve.report/api/cve/CVE-2024-35932.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-35932","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-35932"},"summary":{"title":"drm/vc4: don't check if plane->state->fb == state->fb","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: don't check if plane->state->fb == state->fb\n\nCurrently, when using non-blocking commits, we can see the following\nkernel warning:\n\n[  110.908514] ------------[ cut here ]------------\n[  110.908529] refcount_t: underflow; use-after-free.\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\n[  110.909170] sp : ffffffc00913b9c0\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\n[  110.909434] Call trace:\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\n[  110.914873]  invoke_syscall+0x4c/0x114\n[  110.914897]  el0_svc_common+0xd0/0x118\n[  110.914917]  do_el0_svc+0x38/0xd0\n[  110.914936]  el0_svc+0x30/0x8c\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\n[  110.914979]  el0t_64_sync+0x18c/0x190\n[  110.914996] ---[ end trace 0000000000000000 ]---\n\nThis happens because, although `prepare_fb` and `cleanup_fb` are\nperfectly balanced, we cannot guarantee consistency in the check\nplane->state->fb == state->fb. This means that sometimes we can increase\nthe refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The\nopposite can also be true.\n\nIn fact, the struct drm_plane .state shouldn't be accessed directly\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\nbe used. So, we could stick to this check, but using\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2024-05-19 11:15:49","updated_at":"2026-08-04 11:18:12"},"problem_types":["CWE-416"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c","name":"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40","name":"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd","name":"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9","name":"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-35932","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-35932","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9f19259b84dc648f207a46f3581d15eeaedf4b6 48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9f19259b84dc648f207a46f3581d15eeaedf4b6 d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9f19259b84dc648f207a46f3581d15eeaedf4b6 5343f724c912c77541029123f47ecd3d2ea63bdd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9f19259b84dc648f207a46f3581d15eeaedf4b6 5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.86 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.27 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8.6 6.8.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2024","cve_id":"35932","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2024-35932","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2024-06-17T17:38:26.855561Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2024-06-17T17:40:48.456Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"},{"providerMetadata":{"dateUpdated":"2024-08-02T03:21:48.974Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40"},{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c"},{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd"},{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9"}],"title":"CVE Program Container"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/gpu/drm/vc4/vc4_plane.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40","status":"affected","version":"b9f19259b84dc648f207a46f3581d15eeaedf4b6","versionType":"git"},{"lessThan":"d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c","status":"affected","version":"b9f19259b84dc648f207a46f3581d15eeaedf4b6","versionType":"git"},{"lessThan":"5343f724c912c77541029123f47ecd3d2ea63bdd","status":"affected","version":"b9f19259b84dc648f207a46f3581d15eeaedf4b6","versionType":"git"},{"lessThan":"5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9","status":"affected","version":"b9f19259b84dc648f207a46f3581d15eeaedf4b6","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/gpu/drm/vc4/vc4_plane.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.86","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.27","versionType":"semver"},{"lessThanOrEqual":"6.8.*","status":"unaffected","version":"6.8.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.9","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.86","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.27","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.8.6","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.9","versionStartIncluding":"4.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: don't check if plane->state->fb == state->fb\n\nCurrently, when using non-blocking commits, we can see the following\nkernel warning:\n\n[  110.908514] ------------[ cut here ]------------\n[  110.908529] refcount_t: underflow; use-after-free.\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\n[  110.909170] sp : ffffffc00913b9c0\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\n[  110.909434] Call trace:\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\n[  110.914873]  invoke_syscall+0x4c/0x114\n[  110.914897]  el0_svc_common+0xd0/0x118\n[  110.914917]  do_el0_svc+0x38/0xd0\n[  110.914936]  el0_svc+0x30/0x8c\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\n[  110.914979]  el0t_64_sync+0x18c/0x190\n[  110.914996] ---[ end trace 0000000000000000 ]---\n\nThis happens because, although `prepare_fb` and `cleanup_fb` are\nperfectly balanced, we cannot guarantee consistency in the check\nplane->state->fb == state->fb. This means that sometimes we can increase\nthe refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The\nopposite can also be true.\n\nIn fact, the struct drm_plane .state shouldn't be accessed directly\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\nbe used. So, we could stick to this check, but using\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\n---truncated---"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:24:00.185Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40"},{"url":"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c"},{"url":"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd"},{"url":"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9"}],"title":"drm/vc4: don't check if plane->state->fb == state->fb","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2024-35932","datePublished":"2024-05-19T10:10:40.353Z","dateReserved":"2024-05-17T13:50:33.130Z","dateUpdated":"2026-08-04T09:24:00.185Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-05-19 11:15:49","lastModifiedDate":"2026-08-04 11:18:12","problem_types":["CWE-416"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2024-06-17T17:38:26.855561Z","id":"CVE-2024-35932","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.86","matchCriteriaId":"FE734CE8-823E-4412-B78D-CBCE2100A702"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.27","matchCriteriaId":"41504EFE-0C3F-4B7C-B855-EFE4FA9ACB84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.8.6","matchCriteriaId":"22CA5433-1303-41EF-AD4C-F4645DC01541"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"35932","Ordinal":"1","Title":"drm/vc4: don't check if plane->state->fb == state->fb","CVE":"CVE-2024-35932","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"35932","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: don't check if plane->state->fb == state->fb\n\nCurrently, when using non-blocking commits, we can see the following\nkernel warning:\n\n[  110.908514] ------------[ cut here ]------------\n[  110.908529] refcount_t: underflow; use-after-free.\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\n[  110.909170] sp : ffffffc00913b9c0\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\n[  110.909434] Call trace:\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\n[  110.914873]  invoke_syscall+0x4c/0x114\n[  110.914897]  el0_svc_common+0xd0/0x118\n[  110.914917]  do_el0_svc+0x38/0xd0\n[  110.914936]  el0_svc+0x30/0x8c\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\n[  110.914979]  el0t_64_sync+0x18c/0x190\n[  110.914996] ---[ end trace 0000000000000000 ]---\n\nThis happens because, although `prepare_fb` and `cleanup_fb` are\nperfectly balanced, we cannot guarantee consistency in the check\nplane->state->fb == state->fb. This means that sometimes we can increase\nthe refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The\nopposite can also be true.\n\nIn fact, the struct drm_plane .state shouldn't be accessed directly\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\nbe used. So, we could stick to this check, but using\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\n---truncated---","Type":"Description","Title":"drm/vc4: don't check if plane->state->fb == state->fb"}]}}}