CVE-2026-46157

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And, in this\ncase, it may lead to more severe problem because it's a bit field; as\nwriting the data, it may overwrite other bit fields as well, which\nconfuses the operation completely, as spotted by fuzzing.\n\nFix it by covering runtime.oss.trigger bit fled also with the existing\nparams_lock mutex in both snd_pcm_oss_get_trigger() and\nsnd_pcm_oss_poll()."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached only through the OSS PCM device file (/dev/dsp) via poll() and ioctl(SNDCTL_DSP_GETTRIGGER); there is no network exposure, so local access is required.\nAC:L - This is a data race where the attacker controls both sides\u2014issuing concurrent poll()/select() and trigger ioctls from multiple threads on the same fd\u2014so per guidance the complexity is Low.\nPR:L - Triggering requires opening the OSS audio device, available to an unprivileged local user with audio access (audio group / logind ACL); no real root or capability is needed and the path has no privilege checks.\nUI:N - The attacker performs all setup and race triggering itself; no action by another user is required.\nS:U - The flaw and its impact remain within the kernel's security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Clobbering the params/prepare control bits desynchronizes buffer (re)allocation and preparation, allowing use of a stale/mis-sized runtime->oss.buffer that can leak adjacent kernel heap contents through the OSS read path.\nI:H - The same bit-field corruption can drive buffer free/realloc and prepare mismanagement, producing a use-after-free/out-of-bounds write primitive on the heap-allocated oss.buffer.\nA:H - The \"confused\" operation from corrupted control flags readily produces a kernel oops/panic, and the potential UAF on oss.buffer crashes the kernel even when not fully exploited."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/core/oss/pcm_oss.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e718cecb73214f53fe8f48083eb7afe9b0921103", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c937a494901df8fbfaa5037a5883a7cd44282ea8", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "49f9d048845be874df7997e4b1ce662de450c4b6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ac3e9b55b7da6f0be51720bd330a0edc1a8b61f1", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6b01c1bc9a4748ab37548a700a8aaff910e298e6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "901ac0ff15edf9503162e2cf6579bd11a30f1ed4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/core/oss/pcm_oss.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "2.6.12", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.0.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e718cecb73214f53fe8f48083eb7afe9b0921103"}, {"url": "https://git.kernel.org/stable/c/c937a494901df8fbfaa5037a5883a7cd44282ea8"}, {"url": "https://git.kernel.org/stable/c/49f9d048845be874df7997e4b1ce662de450c4b6"}, {"url": "https://git.kernel.org/stable/c/ac3e9b55b7da6f0be51720bd330a0edc1a8b61f1"}, {"url": "https://git.kernel.org/stable/c/6b01c1bc9a4748ab37548a700a8aaff910e298e6"}, {"url": "https://git.kernel.org/stable/c/901ac0ff15edf9503162e2cf6579bd11a30f1ed4"}], "title": "ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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And, in this\ncase, it may lead to more severe problem because it's a bit field; as\nwriting the data, it may overwrite other bit fields as well, which\nconfuses the operation completely, as spotted by fuzzing.\n\nFix it by covering runtime.oss.trigger bit fled also with the existing\nparams_lock mutex in both snd_pcm_oss_get_trigger() and\nsnd_pcm_oss_poll()."}], "id": "CVE-2026-46157", "lastModified": "2026-10-30T13:18:56.587", "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": "2026-05-28T10:16:31.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/49f9d048845be874df7997e4b1ce662de450c4b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6b01c1bc9a4748ab37548a700a8aaff910e298e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/901ac0ff15edf9503162e2cf6579bd11a30f1ed4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac3e9b55b7da6f0be51720bd330a0edc1a8b61f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c937a494901df8fbfaa5037a5883a7cd44282ea8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e718cecb73214f53fe8f48083eb7afe9b0921103"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger", "id": "2482522", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482522"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-820", "details": ["A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) Pulse Code Modulation (PCM) Open Sound System (OSS) subsystem. A data race vulnerability exists due to concurrent access to the `runtime.oss.trigger` field without proper protection. This unprotected access can lead to the overwriting of other bit fields, which may confuse the system's operation and potentially lead to integrity issues or denial of service."], "name": "CVE-2026-46157", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46157\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46157\nhttps://lore.kernel.org/linux-cve-announce/2026052823-CVE-2026-46157-e578@gregkh/T"], "threat_severity": "Moderate"}

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