Vulnerability-Lookup

CVE-2026-89979 (GCVE-0-2026-89979)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 14:40

Title

ALSA: pcm: Fix race between non-atomic ops and trigger-start

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Fix race between non-atomic ops and trigger-start We protect the races of the concurrent state transitions between atomic PCM ops, but the checks between the non-atomic ops (hw_params, hw_free and prepare) and the atomic ops aren't perfect; there is a check of the conflicting PCM state at the beginning of hw_params & co, but the atomic PCM ops can be still issued during the non-atomic PCM operations. An example such scenario is that a thread A re-issues the PREPARE or HW_PARAMS for the already prepared stream, while another thread B triggers the PCM start in the middle of the prepare operation. Although this usually doesn't lead to much serious issues, it can give some inconsistency as reported by syzkaller (such as ODEBUG warning). There are various atomic PCM ops, and basically the only problem is the PCM start as it operates from the PREPARED state. Other trigger commands (stop, etc) are for the running or the other special state, hence they are filtered as pre-condition. This patch is for preventing the PCM trigger-start during the non- atomic operations in order to address the problems above. Fortunately, the hw_params, hw_free and prepare operations call snd_pcm_buffer_access_lock(), and this can be used for checking the concurrent operations at the PCM trigger -- which sets the runtime->buffer_accessing to a negative (if possible), so the PCM trigger just needs to check the runtime->buffer_accessing value; if it's negative, it means the concurrent non-atomic PCM ops is running.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/b1d12144557fceed5…
https://git.kernel.org/stable/c/b2edc017f94c08bdd…
https://git.kernel.org/stable/c/b599e7f1644138675…
https://git.kernel.org/stable/c/ad29779736cfd6f55…
https://git.kernel.org/stable/c/5abeb4f9f2023f001…
https://git.kernel.org/stable/c/7ad2ea7c10044b08e…
https://git.kernel.org/stable/c/50afadf1ea6659711…
https://git.kernel.org/stable/c/acac7b5e07349a9d1…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b1d12144557fceed5de6e22e2c2e30a40ed37702 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b2edc017f94c08bdd0b046a586e43ac771a2f942 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b599e7f16441386754ec083fa62a549bccb02fca (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ad29779736cfd6f5595f0cab300dd7611418e363 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7ad2ea7c10044b08ecf7b04376916faf12e17a99 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 50afadf1ea66597116eb14e73c24da7ae99b759f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < acac7b5e07349a9d10d78873afb4b93cd1dc721f (git) Affected: 0 , < 5.10.270 (semver) Affected: 0 , < 5.15.221 (semver) Affected: 0 , < 6.1.188 (semver) Affected: 0 , < 6.6.157 (semver) Affected: 0 , < 6.12.110 (semver) Affected: 0 , < 6.18.51 (semver) Affected: 0 , < 7.2.5 (semver)	guessed
Linux	Linux	Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)	guessed

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              "versionType": "original_commit_for_fix"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Fix race between non-atomic ops and trigger-start\n\nWe protect the races of the concurrent state transitions between\natomic PCM ops, but the checks between the non-atomic ops (hw_params,\nhw_free and prepare) and the atomic ops aren\u0027t perfect; there is a\ncheck of the conflicting PCM state at the beginning of hw_params \u0026 co,\nbut the atomic PCM ops can be still issued during the non-atomic PCM\noperations.  An example such scenario is that a thread A re-issues the\nPREPARE or HW_PARAMS for the already prepared stream, while another\nthread B triggers the PCM start in the middle of the prepare\noperation.  Although this usually doesn\u0027t lead to much serious issues,\nit can give some inconsistency as reported by syzkaller (such as\nODEBUG warning).\n\nThere are various atomic PCM ops, and basically the only problem is\nthe PCM start as it operates from the PREPARED state.  Other trigger\ncommands (stop, etc) are for the running or the other special state,\nhence they are filtered as pre-condition.\n\nThis patch is for preventing the PCM trigger-start during the non-\natomic operations in order to address the problems above.\nFortunately, the hw_params, hw_free and prepare operations call\nsnd_pcm_buffer_access_lock(), and this can be used for checking the\nconcurrent operations at the PCM trigger -- which sets the\nruntime-\u003ebuffer_accessing to a negative (if possible), so the PCM\ntrigger just needs to check the runtime-\u003ebuffer_accessing value; if\nit\u0027s negative, it means the concurrent non-atomic PCM ops is running."
        }
      ],
      "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"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The race is reached only through local ALSA PCM character devices (/dev/snd/pcmC*D*) via concurrent open/ioctl syscalls (SNDRV_PCM_IOCTL_HW_PARAMS, HW_FREE, PREPARE versus START). There is no network or Bluetooth path into snd_pcm_pre_start(); USB-gadget snd_pcm_kernel_ioctl is a lower-severity physical path.\nAC:L - The attacker controls both sides by issuing PREPARE/HW_PARAMS/HW_FREE on one thread while another issues SNDRV_PCM_IOCTL_START on the same prepared PCM fd. Syzbot produced a C reproducer of the dummy hrtimer race, so success does not depend on conditions outside attacker control.\nPR:L - snd_pcm_open() and the PCM ioctl path perform no capability check. Any local user who can open /dev/snd/pcm* (audio group or systemd-logind uaccess on desktops and phones) can trigger the race; real root or init-namespace CAP_SYS_ADMIN is not required.\nUI:N - The attacker performs every step themselves\u2014open, hw_params, prepare, start, and close\u2014on their own PCM file descriptors and threads. No separate victim action such as mounting a filesystem or opening a malicious file is required.\nS:U - The dangling hrtimer and any DMA-buffer use-after-free remain inside the host kernel ALSA PCM subsystem. This is standard kernel memory corruption, not a VM escape, IOMMU/DMA boundary bypass, or other cross-authority impact.\nC:H - Syzbot reports ODEBUG \"free active\" of the dummy_hrtimer_pcm hrtimer in dummy_pcm_close, so dummy_hrtimer_callback can run after kfree. On real hardware, START during hw_free can DMA from a freed PCM buffer. Per CNA UAF guidance this enables high-impact disclosure.\nI:H - The freed dummy_hrtimer_pcm (or hardware DMA pages freed by hw_free/hw_params while trigger-start is running) can be reclaimed; the hrtimer callback then invokes snd_pcm_period_elapsed on attacker-controlled memory, and in-flight DMA can write freed pages, yielding write and control-flow primitives.\nA:H - Freeing an armed hrtimer and racing PCM start against buffer teardown dereference freed kernel memory, causing oops or panic. Syzbot reproduced the ODEBUG WARN on dummy close, and the UAF remains a system-wide crash even without a full exploit."
            }
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        "dateUpdated": "2026-09-16T14:40:57.992Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/b1d12144557fceed5de6e22e2c2e30a40ed37702"
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        {
          "url": "https://git.kernel.org/stable/c/b2edc017f94c08bdd0b046a586e43ac771a2f942"
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        {
          "url": "https://git.kernel.org/stable/c/b599e7f16441386754ec083fa62a549bccb02fca"
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        {
          "url": "https://git.kernel.org/stable/c/ad29779736cfd6f5595f0cab300dd7611418e363"
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        {
          "url": "https://git.kernel.org/stable/c/acac7b5e07349a9d10d78873afb4b93cd1dc721f"
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      "title": "ALSA: pcm: Fix race between non-atomic ops and trigger-start",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89979",
    "datePublished": "2026-09-16T10:32:56.643Z",
    "dateReserved": "2026-09-11T19:38:34.779Z",
    "dateUpdated": "2026-09-16T14:40:57.992Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89979\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:08.770\",\"lastModified\":\"2026-09-16T15:18:22.040\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: pcm: Fix race between non-atomic ops and trigger-start\\n\\nWe protect the races of the concurrent state transitions between\\natomic PCM ops, but the checks between the non-atomic ops (hw_params,\\nhw_free and prepare) and the atomic ops aren\u0027t perfect; there is a\\ncheck of the conflicting PCM state at the beginning of hw_params \u0026 co,\\nbut the atomic PCM ops can be still issued during the non-atomic PCM\\noperations.  An example such scenario is that a thread A re-issues the\\nPREPARE or HW_PARAMS for the already prepared stream, while another\\nthread B triggers the PCM start in the middle of the prepare\\noperation.  Although this usually doesn\u0027t lead to much serious issues,\\nit can give some inconsistency as reported by syzkaller (such as\\nODEBUG warning).\\n\\nThere are various atomic PCM ops, and basically the only problem is\\nthe PCM start as it operates from the PREPARED state.  Other trigger\\ncommands (stop, etc) are for the running or the other special state,\\nhence they are filtered as pre-condition.\\n\\nThis patch is for preventing the PCM trigger-start during the non-\\natomic operations in order to address the problems above.\\nFortunately, the hw_params, hw_free and prepare operations call\\nsnd_pcm_buffer_access_lock(), and this can be used for checking the\\nconcurrent operations at the PCM trigger -- which sets the\\nruntime-\u003ebuffer_accessing to a negative (if possible), so the PCM\\ntrigger just needs to check the runtime-\u003ebuffer_accessing value; if\\nit\u0027s negative, it means the concurrent non-atomic PCM ops is running.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/core/pcm_native.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b1d12144557fceed5de6e22e2c2e30a40ed37702\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b2edc017f94c08bdd0b046a586e43ac771a2f942\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b599e7f16441386754ec083fa62a549bccb02fca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"ad29779736cfd6f5595f0cab300dd7611418e363\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7ad2ea7c10044b08ecf7b04376916faf12e17a99\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"50afadf1ea66597116eb14e73c24da7ae99b759f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"acac7b5e07349a9d10d78873afb4b93cd1dc721f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10.270\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15.221\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.1.188\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.6.157\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.12.110\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18.51\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.2.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/core/pcm_native.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.51\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.5\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/50afadf1ea66597116eb14e73c24da7ae99b759f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ad2ea7c10044b08ecf7b04376916faf12e17a99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acac7b5e07349a9d10d78873afb4b93cd1dc721f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad29779736cfd6f5595f0cab300dd7611418e363\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1d12144557fceed5de6e22e2c2e30a40ed37702\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2edc017f94c08bdd0b046a586e43ac771a2f942\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b599e7f16441386754ec083fa62a549bccb02fca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-89979

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 15:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/50afadf1ea66597116eb14e73c24da7ae99b759f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ad2ea7c10044b08ecf7b04376916faf12e17a99
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/acac7b5e07349a9d10d78873afb4b93cd1dc721f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ad29779736cfd6f5595f0cab300dd7611418e363
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1d12144557fceed5de6e22e2c2e30a40ed37702
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b2edc017f94c08bdd0b046a586e43ac771a2f942
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b599e7f16441386754ec083fa62a549bccb02fca

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/pcm_native.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b1d12144557fceed5de6e22e2c2e30a40ed37702",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b2edc017f94c08bdd0b046a586e43ac771a2f942",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b599e7f16441386754ec083fa62a549bccb02fca",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "ad29779736cfd6f5595f0cab300dd7611418e363",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "7ad2ea7c10044b08ecf7b04376916faf12e17a99",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "50afadf1ea66597116eb14e73c24da7ae99b759f",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "acac7b5e07349a9d10d78873afb4b93cd1dc721f",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.270",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.221",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.188",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.157",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.110",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.51",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "7.2.5",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/core/pcm_native.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "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-rc2",
              "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\nALSA: pcm: Fix race between non-atomic ops and trigger-start\n\nWe protect the races of the concurrent state transitions between\natomic PCM ops, but the checks between the non-atomic ops (hw_params,\nhw_free and prepare) and the atomic ops aren\u0027t perfect; there is a\ncheck of the conflicting PCM state at the beginning of hw_params \u0026 co,\nbut the atomic PCM ops can be still issued during the non-atomic PCM\noperations.  An example such scenario is that a thread A re-issues the\nPREPARE or HW_PARAMS for the already prepared stream, while another\nthread B triggers the PCM start in the middle of the prepare\noperation.  Although this usually doesn\u0027t lead to much serious issues,\nit can give some inconsistency as reported by syzkaller (such as\nODEBUG warning).\n\nThere are various atomic PCM ops, and basically the only problem is\nthe PCM start as it operates from the PREPARED state.  Other trigger\ncommands (stop, etc) are for the running or the other special state,\nhence they are filtered as pre-condition.\n\nThis patch is for preventing the PCM trigger-start during the non-\natomic operations in order to address the problems above.\nFortunately, the hw_params, hw_free and prepare operations call\nsnd_pcm_buffer_access_lock(), and this can be used for checking the\nconcurrent operations at the PCM trigger -- which sets the\nruntime-\u003ebuffer_accessing to a negative (if possible), so the PCM\ntrigger just needs to check the runtime-\u003ebuffer_accessing value; if\nit\u0027s negative, it means the concurrent non-atomic PCM ops is running."
    }
  ],
  "id": "CVE-2026-89979",
  "lastModified": "2026-09-16T15:18:22.040",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-16T11:17:08.770",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/50afadf1ea66597116eb14e73c24da7ae99b759f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ad2ea7c10044b08ecf7b04376916faf12e17a99"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/acac7b5e07349a9d10d78873afb4b93cd1dc721f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad29779736cfd6f5595f0cab300dd7611418e363"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1d12144557fceed5de6e22e2c2e30a40ed37702"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b2edc017f94c08bdd0b046a586e43ac771a2f942"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b599e7f16441386754ec083fa62a549bccb02fca"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-R2RW-736Q-8CV3

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31

Details

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

ALSA: pcm: Fix race between non-atomic ops and trigger-start

We protect the races of the concurrent state transitions between atomic PCM ops, but the checks between the non-atomic ops (hw_params, hw_free and prepare) and the atomic ops aren't perfect; there is a check of the conflicting PCM state at the beginning of hw_params & co, but the atomic PCM ops can be still issued during the non-atomic PCM operations. An example such scenario is that a thread A re-issues the PREPARE or HW_PARAMS for the already prepared stream, while another thread B triggers the PCM start in the middle of the prepare operation. Although this usually doesn't lead to much serious issues, it can give some inconsistency as reported by syzkaller (such as ODEBUG warning).

There are various atomic PCM ops, and basically the only problem is the PCM start as it operates from the PREPARED state. Other trigger commands (stop, etc) are for the running or the other special state, hence they are filtered as pre-condition.

This patch is for preventing the PCM trigger-start during the non- atomic operations in order to address the problems above. Fortunately, the hw_params, hw_free and prepare operations call snd_pcm_buffer_access_lock(), and this can be used for checking the concurrent operations at the PCM trigger -- which sets the runtime->buffer_accessing to a negative (if possible), so the PCM trigger just needs to check the runtime->buffer_accessing value; if it's negative, it means the concurrent non-atomic PCM ops is running.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89979"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:08Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Fix race between non-atomic ops and trigger-start\n\nWe protect the races of the concurrent state transitions between\natomic PCM ops, but the checks between the non-atomic ops (hw_params,\nhw_free and prepare) and the atomic ops aren\u0027t perfect; there is a\ncheck of the conflicting PCM state at the beginning of hw_params \u0026 co,\nbut the atomic PCM ops can be still issued during the non-atomic PCM\noperations.  An example such scenario is that a thread A re-issues the\nPREPARE or HW_PARAMS for the already prepared stream, while another\nthread B triggers the PCM start in the middle of the prepare\noperation.  Although this usually doesn\u0027t lead to much serious issues,\nit can give some inconsistency as reported by syzkaller (such as\nODEBUG warning).\n\nThere are various atomic PCM ops, and basically the only problem is\nthe PCM start as it operates from the PREPARED state.  Other trigger\ncommands (stop, etc) are for the running or the other special state,\nhence they are filtered as pre-condition.\n\nThis patch is for preventing the PCM trigger-start during the non-\natomic operations in order to address the problems above.\nFortunately, the hw_params, hw_free and prepare operations call\nsnd_pcm_buffer_access_lock(), and this can be used for checking the\nconcurrent operations at the PCM trigger -- which sets the\nruntime-\u003ebuffer_accessing to a negative (if possible), so the PCM\ntrigger just needs to check the runtime-\u003ebuffer_accessing value; if\nit\u0027s negative, it means the concurrent non-atomic PCM ops is running.",
  "id": "GHSA-r2rw-736q-8cv3",
  "modified": "2026-09-16T15:31:04Z",
  "published": "2026-09-16T12:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89979"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50afadf1ea66597116eb14e73c24da7ae99b759f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5abeb4f9f2023f001d693b4e5e1ebbf25e25d0eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ad2ea7c10044b08ecf7b04376916faf12e17a99"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/acac7b5e07349a9d10d78873afb4b93cd1dc721f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad29779736cfd6f5595f0cab300dd7611418e363"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1d12144557fceed5de6e22e2c2e30a40ed37702"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2edc017f94c08bdd0b046a586e43ac771a2f942"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b599e7f16441386754ec083fa62a549bccb02fca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-89979 (GCVE-0-2026-89979)

FKIE_CVE-2026-89979

GHSA-R2RW-736Q-8CV3

Tags

Sightings

Nomenclature

Related by attack behaviour