Vulnerability-Lookup

CVE-2026-80916 (GCVE-0-2026-80916)

Vulnerability from cvelistv5 – Published: 2026-09-09 16:13 – Updated: 2026-09-09 16:13

Title

kcov: fix data corruption and race conditions on PREEMPT_RT

Summary

In the Linux kernel, the following vulnerability has been resolved: kcov: fix data corruption and race conditions on PREEMPT_RT syzbot is reporting KCOV state corruption on PREEMPT_RT kernels, for the temporary storage used for saving/restoring remote KCOV state is currently allocated as the per-CPU area. On PREEMPT_RT kernels, softirq handlers run as preemptible task threads (e.g., ksoftirqd). If a softirq context preempts a task running a remote KCOV session, it safely saves the task's state into the per-CPU area. However, if that softirq thread is subsequently preempted by a higher- priority softirq thread on the same CPU, the second softirq will overwrite the same per-CPU area, permanently destroying the original task's KCOV state. Fix this data corruption by moving the temporary storage from the per-CPU area to the per-thread area. Since each softirq thread now owns its own task context, nested softirq preemption no longer causes data overwrites. Note that while the temporary storage is now on a per-thread basis, the per-CPU kcov_percpu_data.lock must be retained, for we need to ensure that kcov_remote_start() and kcov_remote_stop() operate atomically without racing against asynchronous interrupts that manipulate the current task's KCOV state. It is likely that GFP_KERNEL allocation by vmalloc_node() in kcov_init() has already called panic() before returning NULL, for there will be no OOM-killable userspace processes when __init function of built-in module runs. But this patch also fixes crashing the kernel when vmalloc_node() in kcov_init() returned NULL, for kcov_init() left per-CPU irq_area == NULL but kcov_remote_start() depends on per-CPU irq_area != NULL, resulting in (1) doing vmalloc() in kcov_remote_start() despite !in_task() context (2) out-of-array-bounds access if (1) succeeded but kcov->remote_size < CONFIG_KCOV_IRQ_AREA_SIZE (3) always leak memory allocated by (1), eventually killing all OOM-killable userspace processes problems.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/ef7048d8a614c5f5a…
https://git.kernel.org/stable/c/8ed3ddf23d39bf533…
https://git.kernel.org/stable/c/5dc59fc959b2b5742…
https://git.kernel.org/stable/c/a2fb8222cde23b000…
https://git.kernel.org/stable/c/18799e858b407bf35…
https://git.kernel.org/stable/c/e11f5b48c82703242…
https://git.kernel.org/stable/c/22670d1552fe15582…
https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4…
https://git.kernel.org/stable/c/2eed77fdcb0cc48e8…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < ef7048d8a614c5f5a9b20513a5428101a744514e (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < 8ed3ddf23d39bf5338406bd9f8863d44748cf6ce (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < 5dc59fc959b2b5742985d7ef24bccd1868217dc2 (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < a2fb8222cde23b0001812ed3acb7c0ea36dd94e2 (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < 18799e858b407bf355383c9dd6c06477aa437134 (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < e11f5b48c82703242a3be7a7ae4b4940b4cb4610 (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < 22670d1552fe155822b2abf91f920925f7d067b4 (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761 (git) Affected: 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0 , < 2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c (git)	guessed
Linux	Linux	Affected: 5.8 Unaffected: 0 , < 5.8 (semver) Unaffected: 5.10.269 , ≤ 5.10.* (semver) Unaffected: 5.15.220 , ≤ 5.15.* (semver) Unaffected: 6.1.185 , ≤ 6.1.* (semver) Unaffected: 6.6.154 , ≤ 6.6.* (semver) Unaffected: 6.12.106 , ≤ 6.12.* (semver) Unaffected: 6.18.47 , ≤ 6.18.* (semver) Unaffected: 7.1.11 , ≤ 7.1.* (semver) Unaffected: 7.2.1 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)	guessed

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              "version": "0",
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              "status": "unaffected",
              "version": "5.10.269",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.154",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.106",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
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            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
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            },
            {
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            }
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        {
          "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\u0027s 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\u0027s 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\u0027s\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-\u003eremote_size \u003c CONFIG_KCOV_IRQ_AREA_SIZE\n\n  (3) always leak memory allocated by (1), eventually killing all\n      OOM-killable userspace processes\n\nproblems."
        }
      ],
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        "dateUpdated": "2026-09-09T16:13:14.587Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e"
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        {
          "url": "https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c"
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      ],
      "title": "kcov: fix data corruption and race conditions on PREEMPT_RT",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80916",
    "datePublished": "2026-09-09T16:13:14.587Z",
    "dateReserved": "2026-08-26T14:34:25.801Z",
    "dateUpdated": "2026-09-09T16:13:14.587Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80916\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-09T17:17:46.513\",\"lastModified\":\"2026-09-09T17:17:46.513\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\u0027s 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\u0027s 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\u0027s\\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-\u003eremote_size \u003c 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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/sched.h\",\"kernel/kcov.c\",\"lib/Kconfig.debug\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"ef7048d8a614c5f5a9b20513a5428101a744514e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"8ed3ddf23d39bf5338406bd9f8863d44748cf6ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"5dc59fc959b2b5742985d7ef24bccd1868217dc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"a2fb8222cde23b0001812ed3acb7c0ea36dd94e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"18799e858b407bf355383c9dd6c06477aa437134\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"e11f5b48c82703242a3be7a7ae4b4940b4cb4610\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"22670d1552fe155822b2abf91f920925f7d067b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ff3b30ab57da82d8db4f14662a2858cabfbc2c0\",\"lessThan\":\"2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/sched.h\",\"kernel/kcov.c\",\"lib/Kconfig.debug\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/18799e858b407bf355383c9dd6c06477aa437134\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/22670d1552fe155822b2abf91f920925f7d067b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5dc59fc959b2b5742985d7ef24bccd1868217dc2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8ed3ddf23d39bf5338406bd9f8863d44748cf6ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2fb8222cde23b0001812ed3acb7c0ea36dd94e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e11f5b48c82703242a3be7a7ae4b4940b4cb4610\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-80916

Vulnerability from fkie_nvd - Published: 2026-09-09 17:17 - Updated: 2026-09-09 17:17

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/18799e858b407bf355383c9dd6c06477aa437134
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/22670d1552fe155822b2abf91f920925f7d067b4
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5dc59fc959b2b5742985d7ef24bccd1868217dc2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8ed3ddf23d39bf5338406bd9f8863d44748cf6ce
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a2fb8222cde23b0001812ed3acb7c0ea36dd94e2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e11f5b48c82703242a3be7a7ae4b4940b4cb4610
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/sched.h",
            "kernel/kcov.c",
            "lib/Kconfig.debug"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ef7048d8a614c5f5a9b20513a5428101a744514e",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "8ed3ddf23d39bf5338406bd9f8863d44748cf6ce",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "5dc59fc959b2b5742985d7ef24bccd1868217dc2",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "a2fb8222cde23b0001812ed3acb7c0ea36dd94e2",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "18799e858b407bf355383c9dd6c06477aa437134",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "e11f5b48c82703242a3be7a7ae4b4940b4cb4610",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "22670d1552fe155822b2abf91f920925f7d067b4",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            },
            {
              "lessThan": "2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c",
              "status": "affected",
              "version": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/sched.h",
            "kernel/kcov.c",
            "lib/Kconfig.debug"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.106",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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\u0027s 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\u0027s 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\u0027s\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-\u003eremote_size \u003c CONFIG_KCOV_IRQ_AREA_SIZE\n\n  (3) always leak memory allocated by (1), eventually killing all\n      OOM-killable userspace processes\n\nproblems."
    }
  ],
  "id": "CVE-2026-80916",
  "lastModified": "2026-09-09T17:17:46.513",
  "metrics": {},
  "published": "2026-09-09T17:17:46.513",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18799e858b407bf355383c9dd6c06477aa437134"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/22670d1552fe155822b2abf91f920925f7d067b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5dc59fc959b2b5742985d7ef24bccd1868217dc2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8ed3ddf23d39bf5338406bd9f8863d44748cf6ce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a2fb8222cde23b0001812ed3acb7c0ea36dd94e2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e11f5b48c82703242a3be7a7ae4b4940b4cb4610"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-CJJ8-H3VV-GX8R

Vulnerability from github – Published: 2026-09-09 18:32 – Updated: 2026-09-09 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

kcov: fix data corruption and race conditions on PREEMPT_RT

syzbot is reporting KCOV state corruption on PREEMPT_RT kernels, for the temporary storage used for saving/restoring remote KCOV state is currently allocated as the per-CPU area.

On PREEMPT_RT kernels, softirq handlers run as preemptible task threads (e.g., ksoftirqd). If a softirq context preempts a task running a remote KCOV session, it safely saves the task's state into the per-CPU area. However, if that softirq thread is subsequently preempted by a higher- priority softirq thread on the same CPU, the second softirq will overwrite the same per-CPU area, permanently destroying the original task's KCOV state.

Fix this data corruption by moving the temporary storage from the per-CPU area to the per-thread area. Since each softirq thread now owns its own task context, nested softirq preemption no longer causes data overwrites.

Note that while the temporary storage is now on a per-thread basis, the per-CPU kcov_percpu_data.lock must be retained, for we need to ensure that kcov_remote_start() and kcov_remote_stop() operate atomically without racing against asynchronous interrupts that manipulate the current task's KCOV state.

It is likely that GFP_KERNEL allocation by vmalloc_node() in kcov_init() has already called panic() before returning NULL, for there will be no OOM-killable userspace processes when __init function of built-in module runs. But this patch also fixes crashing the kernel when vmalloc_node() in kcov_init() returned NULL, for kcov_init() left per-CPU irq_area == NULL but kcov_remote_start() depends on per-CPU irq_area != NULL, resulting in

(1) doing vmalloc() in kcov_remote_start() despite !in_task() context

(2) out-of-array-bounds access if (1) succeeded but kcov->remote_size < CONFIG_KCOV_IRQ_AREA_SIZE

(3) always leak memory allocated by (1), eventually killing all OOM-killable userspace processes

problems.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-80916"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-09T17:17:46Z",
    "severity": null
  },
  "details": "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\u0027s 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\u0027s 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\u0027s\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-\u003eremote_size \u003c CONFIG_KCOV_IRQ_AREA_SIZE\n\n  (3) always leak memory allocated by (1), eventually killing all\n      OOM-killable userspace processes\n\nproblems.",
  "id": "GHSA-cjj8-h3vv-gx8r",
  "modified": "2026-09-09T18:32:04Z",
  "published": "2026-09-09T18:32:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80916"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18799e858b407bf355383c9dd6c06477aa437134"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22670d1552fe155822b2abf91f920925f7d067b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5dc59fc959b2b5742985d7ef24bccd1868217dc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ed3ddf23d39bf5338406bd9f8863d44748cf6ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2fb8222cde23b0001812ed3acb7c0ea36dd94e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e11f5b48c82703242a3be7a7ae4b4940b4cb4610"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-80916 (GCVE-0-2026-80916)

FKIE_CVE-2026-80916

GHSA-CJJ8-H3VV-GX8R

Tags

Sightings

Nomenclature