{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80916", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80916", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-09T16:13:14.587Z", "updatedAt": "2026-10-19T08:45:00.547Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "kcov: fix data corruption and race conditions on PREEMPT_RT", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcov: fix data corruption and race conditions on PREEMPT_RT\n\nsyzbot is reporting KCOV state corruption on PREEMPT_RT kernels, for the\ntemporary storage used for saving/restoring remote KCOV state is currently\nallocated as the per-CPU area.\n\nOn PREEMPT_RT kernels, softirq handlers run as preemptible task threads\n(e.g., ksoftirqd). If a softirq context preempts a task running a remote\nKCOV session, it safely saves the task's state into the per-CPU area.\nHowever, if that softirq thread is subsequently preempted by a higher-\npriority softirq thread on the same CPU, the second softirq will overwrite\nthe same per-CPU area, permanently destroying the original task's KCOV\nstate.\n\nFix this data corruption by moving the temporary storage from the per-CPU\narea to the per-thread area. Since each softirq thread now owns its own\ntask context, nested softirq preemption no longer causes data overwrites.\n\nNote that while the temporary storage is now on a per-thread basis, the\nper-CPU kcov_percpu_data.lock must be retained, for we need to ensure that\nkcov_remote_start() and kcov_remote_stop() operate atomically without\nracing against asynchronous interrupts that manipulate the current task's\nKCOV state.\n\nIt is likely that GFP_KERNEL allocation by vmalloc_node() in kcov_init()\nhas already called panic() before returning NULL, for there will be no\nOOM-killable userspace processes when __init function of built-in module\nruns. But this patch also fixes crashing the kernel when vmalloc_node()\nin kcov_init() returned NULL, for kcov_init() left per-CPU irq_area == NULL\nbut kcov_remote_start() depends on per-CPU irq_area != NULL, resulting in\n\n (1) doing vmalloc() in kcov_remote_start() despite !in_task() context\n\n (2) out-of-array-bounds access if (1) succeeded but\n kcov->remote_size < CONFIG_KCOV_IRQ_AREA_SIZE\n\n (3) always leak memory allocated by (1), eventually killing all\n OOM-killable userspace processes\n\nproblems.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "ef7048d8a614c5f5a9b20513a5428101a744514e" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "8ed3ddf23d39bf5338406bd9f8863d44748cf6ce" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "5dc59fc959b2b5742985d7ef24bccd1868217dc2" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "a2fb8222cde23b0001812ed3acb7c0ea36dd94e2" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "18799e858b407bf355383c9dd6c06477aa437134" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "e11f5b48c82703242a3be7a7ae4b4940b4cb4610" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "22670d1552fe155822b2abf91f920925f7d067b4" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "status": "affected", "versionType": "git", "lessThan": "2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.8" }, { "version": "5.10.269", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.220", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.185", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.154", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.106", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.47", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2.1", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }