{"api_version":"1","generated_at":"2026-07-23T14:02:18+00:00","cve":"CVE-2026-31580","urls":{"html":"https://cve.report/CVE-2026-31580","api":"https://cve.report/api/cve/CVE-2026-31580.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31580","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31580"},"summary":{"title":"bcache: fix cached_dev.sb_bio use-after-free and crash","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and crash\n\nIn our production environment, we have received multiple crash reports\nregarding libceph, which have caught our attention:\n\n```\n[6888366.280350] Call Trace:\n[6888366.280452]  blk_update_request+0x14e/0x370\n[6888366.280561]  blk_mq_end_request+0x1a/0x130\n[6888366.280671]  rbd_img_handle_request+0x1a0/0x1b0 [rbd]\n[6888366.280792]  rbd_obj_handle_request+0x32/0x40 [rbd]\n[6888366.280903]  __complete_request+0x22/0x70 [libceph]\n[6888366.281032]  osd_dispatch+0x15e/0xb40 [libceph]\n[6888366.281164]  ? inet_recvmsg+0x5b/0xd0\n[6888366.281272]  ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph]\n[6888366.281405]  ceph_con_process_message+0x79/0x140 [libceph]\n[6888366.281534]  ceph_con_v1_try_read+0x5d7/0xf30 [libceph]\n[6888366.281661]  ceph_con_workfn+0x329/0x680 [libceph]\n```\n\nAfter analyzing the coredump file, we found that the address of\ndc->sb_bio has been freed. We know that cached_dev is only freed when it\nis stopped.\n\nSince sb_bio is a part of struct cached_dev, rather than an alloc every\ntime.  If the device is stopped while writing to the superblock, the\nreleased address will be accessed at endio.\n\nThis patch hopes to wait for sb_write to complete in cached_dev_free.\n\nIt should be noted that we analyzed the cause of the problem, then tell\nall details to the QWEN and adopted the modifications it made.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-24 15:16:32","updated_at":"2026-06-01 17:16:48"},"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572","name":"https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1","name":"https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85","name":"https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9","name":"https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128","name":"https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753","name":"https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576","name":"https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27","name":"https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2","name":"https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31580","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31580","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 81f44ed8c3f54abb7561ece774ea4cca5070b2f2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 f50e7c325ab1207fe941555bcff659f6d7050572 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cafe563591446cf80bfbc2fe3bc72a2e36cf1060 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and crash\n\nIn our production environment, we have received multiple crash reports\nregarding libceph, which have caught our attention:\n\n```\n[6888366.280350] Call Trace:\n[6888366.280452]  blk_update_request+0x14e/0x370\n[6888366.280561]  blk_mq_end_request+0x1a/0x130\n[6888366.280671]  rbd_img_handle_request+0x1a0/0x1b0 [rbd]\n[6888366.280792]  rbd_obj_handle_request+0x32/0x40 [rbd]\n[6888366.280903]  __complete_request+0x22/0x70 [libceph]\n[6888366.281032]  osd_dispatch+0x15e/0xb40 [libceph]\n[6888366.281164]  ? inet_recvmsg+0x5b/0xd0\n[6888366.281272]  ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph]\n[6888366.281405]  ceph_con_process_message+0x79/0x140 [libceph]\n[6888366.281534]  ceph_con_v1_try_read+0x5d7/0xf30 [libceph]\n[6888366.281661]  ceph_con_workfn+0x329/0x680 [libceph]\n```\n\nAfter analyzing the coredump file, we found that the address of\ndc->sb_bio has been freed. We know that cached_dev is only freed when it\nis stopped.\n\nSince sb_bio is a part of struct cached_dev, rather than an alloc every\ntime.  If the device is stopped while writing to the superblock, the\nreleased address will be accessed at endio.\n\nThis patch hopes to wait for sb_write to complete in cached_dev_free.\n\nIt should be noted that we analyzed the cause of the problem, then tell\nall details to the QWEN and adopted the modifications it made."}],"providerMetadata":{"dateUpdated":"2026-06-01T16:11:52.311Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2"},{"url":"https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572"},{"url":"https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85"},{"url":"https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1"},{"url":"https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753"},{"url":"https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576"},{"url":"https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27"},{"url":"https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9"},{"url":"https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128"}],"title":"bcache: fix cached_dev.sb_bio use-after-free and crash","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31580","datePublished":"2026-04-24T14:42:10.874Z","dateReserved":"2026-03-09T15:48:24.119Z","dateUpdated":"2026-06-01T16:11:52.311Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-24 15:16:32","lastModifiedDate":"2026-06-01 17:16:48","problem_types":["CWE-416"],"metrics":{"cvssMetricV31":[{"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}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.136","matchCriteriaId":"14109CEF-714B-4029-A318-97AA58A01833"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.83","matchCriteriaId":"A8BAD957-8E20-401C-A129-DFF3655CA0B7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.24","matchCriteriaId":"8126B8B8-6D0B-4443-86C1-672AEE893555"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"6.19.14","matchCriteriaId":"D6A8A074-BBF4-4803-ABED-519A839435BB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.0.1","matchCriteriaId":"9B5888AB-7403-4335-89E4-21CC0B48366A"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31580","Ordinal":"1","Title":"bcache: fix cached_dev.sb_bio use-after-free and crash","CVE":"CVE-2026-31580","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31580","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and crash\n\nIn our production environment, we have received multiple crash reports\nregarding libceph, which have caught our attention:\n\n```\n[6888366.280350] Call Trace:\n[6888366.280452]  blk_update_request+0x14e/0x370\n[6888366.280561]  blk_mq_end_request+0x1a/0x130\n[6888366.280671]  rbd_img_handle_request+0x1a0/0x1b0 [rbd]\n[6888366.280792]  rbd_obj_handle_request+0x32/0x40 [rbd]\n[6888366.280903]  __complete_request+0x22/0x70 [libceph]\n[6888366.281032]  osd_dispatch+0x15e/0xb40 [libceph]\n[6888366.281164]  ? inet_recvmsg+0x5b/0xd0\n[6888366.281272]  ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph]\n[6888366.281405]  ceph_con_process_message+0x79/0x140 [libceph]\n[6888366.281534]  ceph_con_v1_try_read+0x5d7/0xf30 [libceph]\n[6888366.281661]  ceph_con_workfn+0x329/0x680 [libceph]\n```\n\nAfter analyzing the coredump file, we found that the address of\ndc->sb_bio has been freed. We know that cached_dev is only freed when it\nis stopped.\n\nSince sb_bio is a part of struct cached_dev, rather than an alloc every\ntime.  If the device is stopped while writing to the superblock, the\nreleased address will be accessed at endio.\n\nThis patch hopes to wait for sb_write to complete in cached_dev_free.\n\nIt should be noted that we analyzed the cause of the problem, then tell\nall details to the QWEN and adopted the modifications it made.","Type":"Description","Title":"bcache: fix cached_dev.sb_bio use-after-free and crash"}]}}}