{"api_version":"1","generated_at":"2026-10-03T14:24:50+00:00","cve":"CVE-2026-89899","urls":{"html":"https://cve.report/CVE-2026-89899","api":"https://cve.report/api/cve/CVE-2026-89899.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89899","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89899"},"summary":{"title":"media: cec: disable delayed work before freeing an interrupted transmit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: disable delayed work before freeing an interrupted transmit\n\ncec_transmit_msg_fh() drops adap->lock to wait for a blocking transmit in\nwait_for_completion_killable(). If that wait is interrupted by a signal,\ncancel_delayed_work_sync() can run before the CEC kthread arms the reply\ntimeout via schedule_delayed_work(&data->work) in cec_transmit_done_ts().\nThe work is then armed after the cancel, and the data is freed with its\ndelayed_work still pending:\n\n  ODEBUG: free active (active state 0) object: ... hint: cec_wait_timeout\n\nUse disable_delayed_work_sync(): it cancels the work and disables it, so\nthe later schedule_delayed_work() becomes a no-op and the work cannot be\nre-armed. The data is freed right after, so it need not be re-enabled.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:16:58","updated_at":"2026-09-16 15:18:16"},"problem_types":[],"metrics":[{"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/9a951931d4b4084acd64fa55fc3672a9da45ddf9","name":"https://git.kernel.org/stable/c/9a951931d4b4084acd64fa55fc3672a9da45ddf9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c6ceb0949227c1f0cf0e19393daec72d9889871","name":"https://git.kernel.org/stable/c/9c6ceb0949227c1f0cf0e19393daec72d9889871","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a3adb63b121937b97f7fdc51e96564c7c799538b","name":"https://git.kernel.org/stable/c/a3adb63b121937b97f7fdc51e96564c7c799538b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0fbd5c2327020858c45b2d1c65775d64cdeca523","name":"https://git.kernel.org/stable/c/0fbd5c2327020858c45b2d1c65775d64cdeca523","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89899","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89899","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490d84f6d73c12f4204241cff8651eed60aae914 9a951931d4b4084acd64fa55fc3672a9da45ddf9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490d84f6d73c12f4204241cff8651eed60aae914 a3adb63b121937b97f7fdc51e96564c7c799538b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490d84f6d73c12f4204241cff8651eed60aae914 9c6ceb0949227c1f0cf0e19393daec72d9889871 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490d84f6d73c12f4204241cff8651eed60aae914 0fbd5c2327020858c45b2d1c65775d64cdeca523 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e448dfd6d3ec944411f6575bc24e4f8baa1e297f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2781b86d7e45de09befa5ace296b66787146561f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.18.19 4.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.2 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.20","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/media/cec/core/cec-adap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9a951931d4b4084acd64fa55fc3672a9da45ddf9","status":"affected","version":"490d84f6d73c12f4204241cff8651eed60aae914","versionType":"git"},{"lessThan":"a3adb63b121937b97f7fdc51e96564c7c799538b","status":"affected","version":"490d84f6d73c12f4204241cff8651eed60aae914","versionType":"git"},{"lessThan":"9c6ceb0949227c1f0cf0e19393daec72d9889871","status":"affected","version":"490d84f6d73c12f4204241cff8651eed60aae914","versionType":"git"},{"lessThan":"0fbd5c2327020858c45b2d1c65775d64cdeca523","status":"affected","version":"490d84f6d73c12f4204241cff8651eed60aae914","versionType":"git"},{"status":"affected","version":"e448dfd6d3ec944411f6575bc24e4f8baa1e297f","versionType":"git"},{"status":"affected","version":"2781b86d7e45de09befa5ace296b66787146561f","versionType":"git"},{"lessThan":"4.19","status":"affected","version":"4.18.19","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.2","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/media/cec/core/cec-adap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.20"},{"lessThan":"4.20","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: disable delayed work before freeing an interrupted transmit\n\ncec_transmit_msg_fh() drops adap->lock to wait for a blocking transmit in\nwait_for_completion_killable(). If that wait is interrupted by a signal,\ncancel_delayed_work_sync() can run before the CEC kthread arms the reply\ntimeout via schedule_delayed_work(&data->work) in cec_transmit_done_ts().\nThe work is then armed after the cancel, and the data is freed with its\ndelayed_work still pending:\n\n  ODEBUG: free active (active state 0) object: ... hint: cec_wait_timeout\n\nUse disable_delayed_work_sync(): it cancels the work and disables it, so\nthe later schedule_delayed_work() becomes a no-op and the work cannot be\nre-armed. The data is freed right after, so it need not be re-enabled."}],"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"},"scenarios":[{"lang":"en","value":"AV:L - The UAF is in cec_transmit_msg_fh(), reached only via the local CEC_TRANSMIT ioctl on /dev/cec* (cec_ioctl to cec_transmit). A CEC peer on the HDMI bus cannot signal-interrupt wait_for_completion_killable(), so this is Local, unlike CEC RX IRQ bugs scored Adjacent.\nAC:L - The attacker issues a blocking CEC_TRANSMIT with a reply timeout and signals their own thread so cancel_delayed_work_sync() races the CEC kthread arming data->work in cec_transmit_done_ts(). They control both sides and can retry; syzkaller triggered it.\nPR:L - cec_open() defaults to CEC_MODE_INITIATOR, and neither CEC_TRANSMIT nor CEC_ADAP_S_LOG_ADDRS calls capable(). Only raw mode needs CAP_SYS_RAWIO and monitor modes need CAP_NET_ADMIN, neither required here. Unprivileged users with /dev/cec (video group, uaccess, Android HDMI-CEC) can trigger it.\nUI:N - The attacker opens /dev/cec, configures logical addresses, issues the blocking transmit ioctl, and delivers a signal to their own process. No separate victim action is required.\nS:U - The use-after-free corrupts kernel heap (struct cec_data) in the host kernel. It does not cross a VM, IOMMU, or other separate security authority.\nC:H - cec_wait_timeout() runs on a kmalloc'd struct cec_data after kfree(), so a sprayed replacement object yields an attacker-controlled adap pointer and list walks. Per kernel CNA guidance, use-after-free is High confidentiality.\nI:H - The delayed-work UAF lets the attacker spray struct cec_data and corrupt list_heads and the adapter mutex when cec_wait_timeout()/cec_data_cancel() run, enabling arbitrary write and control-flow hijack. Per kernel CNA guidance, use-after-free is High integrity.\nA:H - Freeing struct cec_data while its delayed_work is still pending causes cec_wait_timeout() to run on freed memory, producing a kernel oops or panic even without a full exploit. Per kernel CNA guidance, use-after-free is High availability."}]}],"providerMetadata":{"dateUpdated":"2026-09-16T14:39:48.953Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9a951931d4b4084acd64fa55fc3672a9da45ddf9"},{"url":"https://git.kernel.org/stable/c/a3adb63b121937b97f7fdc51e96564c7c799538b"},{"url":"https://git.kernel.org/stable/c/9c6ceb0949227c1f0cf0e19393daec72d9889871"},{"url":"https://git.kernel.org/stable/c/0fbd5c2327020858c45b2d1c65775d64cdeca523"}],"title":"media: cec: disable delayed work before freeing an interrupted transmit","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89899","datePublished":"2026-09-16T10:31:59.589Z","dateReserved":"2026-09-11T19:38:34.774Z","dateUpdated":"2026-09-16T14:39:48.953Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:16:58","lastModifiedDate":"2026-09-16 15:18:16","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89899","Ordinal":"1","Title":"media: cec: disable delayed work before freeing an interrupted t","CVE":"CVE-2026-89899","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89899","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: disable delayed work before freeing an interrupted transmit\n\ncec_transmit_msg_fh() drops adap->lock to wait for a blocking transmit in\nwait_for_completion_killable(). If that wait is interrupted by a signal,\ncancel_delayed_work_sync() can run before the CEC kthread arms the reply\ntimeout via schedule_delayed_work(&data->work) in cec_transmit_done_ts().\nThe work is then armed after the cancel, and the data is freed with its\ndelayed_work still pending:\n\n  ODEBUG: free active (active state 0) object: ... hint: cec_wait_timeout\n\nUse disable_delayed_work_sync(): it cancels the work and disables it, so\nthe later schedule_delayed_work() becomes a no-op and the work cannot be\nre-armed. The data is freed right after, so it need not be re-enabled.","Type":"Description","Title":"media: cec: disable delayed work before freeing an interrupted t"}]}}}