{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80916", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.801Z", "datePublished": "2026-09-09T16:13:14.587Z", "dateUpdated": "2026-10-19T08:45:00.547Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:00.547Z" }, "descriptions": [ { "lang": "en", "value": "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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/sched.h", "kernel/kcov.c", "lib/Kconfig.debug" ], "versions": [ { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "ef7048d8a614c5f5a9b20513a5428101a744514e", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "8ed3ddf23d39bf5338406bd9f8863d44748cf6ce", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "5dc59fc959b2b5742985d7ef24bccd1868217dc2", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "a2fb8222cde23b0001812ed3acb7c0ea36dd94e2", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "18799e858b407bf355383c9dd6c06477aa437134", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "e11f5b48c82703242a3be7a7ae4b4940b4cb4610", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "22670d1552fe155822b2abf91f920925f7d067b4", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761", "status": "affected", "versionType": "git" }, { "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0", "lessThan": "2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/sched.h", "kernel/kcov.c", "lib/Kconfig.debug" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.185", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.154", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.106", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.47", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.11", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.1", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.10.269" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.185" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.106" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.47" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.1.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e" }, { "url": "https://git.kernel.org/stable/c/8ed3ddf23d39bf5338406bd9f8863d44748cf6ce" }, { "url": "https://git.kernel.org/stable/c/5dc59fc959b2b5742985d7ef24bccd1868217dc2" }, { "url": "https://git.kernel.org/stable/c/a2fb8222cde23b0001812ed3acb7c0ea36dd94e2" }, { "url": "https://git.kernel.org/stable/c/18799e858b407bf355383c9dd6c06477aa437134" }, { "url": "https://git.kernel.org/stable/c/e11f5b48c82703242a3be7a7ae4b4940b4cb4610" }, { "url": "https://git.kernel.org/stable/c/22670d1552fe155822b2abf91f920925f7d067b4" }, { "url": "https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761" }, { "url": "https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c" } ], "title": "kcov: fix data corruption and race conditions on PREEMPT_RT", "x_generator": { "engine": "bippy-1.2.0" } } } }