{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80716", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.788Z", "datePublished": "2026-08-28T06:53:14.286Z", "dateUpdated": "2026-08-29T06:22:32.041Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:32.041Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: wake linked drain waiters on unlink\n\nsnd_pcm_drain() on a linked stream parks an on-stack wait entry on the\ndrained peer's runtime->sleep, and after schedule_timeout() removes it\nonly if that peer is still found in the caller's group. If group\nmembership changes during the wait and the sleep ends by signal or\ntimeout (so autoremove_wake_function() does not run), finish_wait() is\nskipped and snd_pcm_drain() returns with the entry still queued on that\nstream's sleep list; a later wake_up() then walks a freed stack frame.\nThis is reachable by unlinking either the drained or the draining stream.\n\nUnlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()),\nsnd_pcm_unlink() never wakes the sleep queues. Wake every group member\nunder the group lock before the membership change, so a linked drainer is\nreleased and drops its entry while the streams are still grouped.\n\nThe window was opened when snd_pcm_link_rwsem stopped being held across\nthe wait and the removal became conditional on group membership (see\nFixes). The later switch to finish_wait() kept that conditional removal,\nso the signal/timeout case remained."}], "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 bug is triggered only via local ALSA PCM character devices (/dev/snd/pcmC*D*) through open/ioctl syscalls (SNDRV_PCM_IOCTL_LINK, UNLINK, DRAIN); snd_pcm_kernel_ioctl does not expose LINK/UNLINK, and there is no network-facing path to this code.\nAC:L - This is a race, but the attacker controls both sides by opening two PCM fds, linking them, blocking one thread in DRAIN, and concurrently UNLINKing or closing the peer; sending a signal or waiting for timeout forces the path where finish_wait() is skipped.\nPR:L - Exploitation requires only a local process able to open and ioctl ALSA PCM nodes (typical desktop/mobile users via the audio group, session ACLs, or equivalent device permissions); no real root, CAP_SYS_ADMIN, or init-namespace privileges are needed.\nUI:N - The attacker drives the entire sequence programmatically with their own PCM file descriptors and threads; no victim interaction such as opening a file, mounting a filesystem, or plugging in hardware is required.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same security authority; this is not a VM escape, IOMMU/DMA boundary bypass, or other cross-scope violation.\nC:H - The orphaned wait_queue_entry_t remains on the sleep list after snd_pcm_drain() returns, and a later wake_up() dereferences a freed on-stack wait entry (use-after-free), which can expose kernel stack/memory contents under attacker-controlled timing.\nI:H - Corrupting the wait-queue list with a stale stack-backed entry gives kernel memory corruption primitives; wake_up() invokes the entry's function pointer from freed stack memory, enabling plausible control-flow hijack and arbitrary write via further heap/stack grooming.\nA:H - A subsequent wake_up() on the poisoned sleep queue walks a freed stack frame and can oops or panic the kernel; even without full exploitation, the UAF reliably threatens system availability on multimedia desktops, kiosks, and embedded devices with ALSA access."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/core/pcm_native.c"], "versions": [{"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "c172e4c53321ee6429955295ea133bc3597a3ca9", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "3035bb784cea3f338934f5042dd3f35225a51b2e", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "1c1b7e8e545ce65e40f65b55c432765e058ea98f", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "e8b784a3f4fba3ea9c4d05138ecfa784a069627f", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "e8315330e4ec09c0cac625515400e13d0ee22b81", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "2940cc3cf43c72126b74ee6376314c195382023a", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "db09bc4ab19ce548a078240d2374792523953500", "status": "affected", "versionType": "git"}, {"version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "lessThan": "f495b6c4c8594122918552c9be2b51eb71647cd9", "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/pcm_native.c"], "versions": [{"version": "5.1", "status": "affected"}, {"version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.1", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9"}, {"url": "https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e"}, {"url": "https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f"}, {"url": "https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f"}, {"url": "https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81"}, {"url": "https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a"}, {"url": "https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500"}, {"url": "https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9"}], "title": "ALSA: pcm: wake linked drain waiters on unlink", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"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": "c172e4c53321ee6429955295ea133bc3597a3ca9", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "3035bb784cea3f338934f5042dd3f35225a51b2e", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "1c1b7e8e545ce65e40f65b55c432765e058ea98f", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "e8b784a3f4fba3ea9c4d05138ecfa784a069627f", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "e8315330e4ec09c0cac625515400e13d0ee22b81", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "2940cc3cf43c72126b74ee6376314c195382023a", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "db09bc4ab19ce548a078240d2374792523953500", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}, {"lessThan": "f495b6c4c8594122918552c9be2b51eb71647cd9", "status": "affected", "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7", "versionType": "git"}]}, {"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": [{"status": "affected", "version": "5.1"}, {"lessThan": "5.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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: wake linked drain waiters on unlink\n\nsnd_pcm_drain() on a linked stream parks an on-stack wait entry on the\ndrained peer's runtime->sleep, and after schedule_timeout() removes it\nonly if that peer is still found in the caller's group. If group\nmembership changes during the wait and the sleep ends by signal or\ntimeout (so autoremove_wake_function() does not run), finish_wait() is\nskipped and snd_pcm_drain() returns with the entry still queued on that\nstream's sleep list; a later wake_up() then walks a freed stack frame.\nThis is reachable by unlinking either the drained or the draining stream.\n\nUnlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()),\nsnd_pcm_unlink() never wakes the sleep queues. Wake every group member\nunder the group lock before the membership change, so a linked drainer is\nreleased and drops its entry while the streams are still grouped.\n\nThe window was opened when snd_pcm_link_rwsem stopped being held across\nthe wait and the removal became conditional on group membership (see\nFixes). The later switch to finish_wait() kept that conditional removal,\nso the signal/timeout case remained."}], "id": "CVE-2026-80716", "lastModified": "2026-08-29T07:16:53.027", "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": "2026-08-28T08:16:57.303", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ALSA: pcm: wake linked drain waiters on unlink", "id": "2525473", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525473"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nALSA: pcm: wake linked drain waiters on unlink\nsnd_pcm_drain() on a linked stream parks an on-stack wait entry on the\ndrained peer's runtime->sleep, and after schedule_timeout() removes it\nonly if that peer is still found in the caller's group. If group\nmembership changes during the wait and the sleep ends by signal or\ntimeout (so autoremove_wake_function() does not run), finish_wait() is\nskipped and snd_pcm_drain() returns with the entry still queued on that\nstream's sleep list; a later wake_up() then walks a freed stack frame.\nThis is reachable by unlinking either the drained or the draining stream.\nUnlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()),\nsnd_pcm_unlink() never wakes the sleep queues. Wake every group member\nunder the group lock before the membership change, so a linked drainer is\nreleased and drops its entry while the streams are still grouped.\nThe window was opened when snd_pcm_link_rwsem stopped being held across\nthe wait and the removal became conditional on group membership (see\nFixes). The later switch to finish_wait() kept that conditional removal,\nso the signal/timeout case remained.", "A flaw was found in the Linux kernel. Specifically, in the Advanced Linux Sound Architecture (ALSA) Pulse-Code Modulation (PCM) subsystem, a use-after-free vulnerability exists. This occurs when a linked stream is unlinked, and a wait entry is not properly removed from the drained peer's sleep list. A local attacker could exploit this to cause a system crash (denial of service) or potentially execute arbitrary code by accessing a freed memory location."], "name": "CVE-2026-80716", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80716\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80716\nhttps://lore.kernel.org/linux-cve-announce/2026082809-CVE-2026-80716-33fd@gregkh/T"], "threat_severity": "Moderate"}