{"id":"CVE-2026-80716","title":"ALSA: pcm: wake linked drain waiters on unlink","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < c172e4c53321ee6429955295ea133bc3597a3ca9","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < 3035bb784cea3f338934f5042dd3f35225a51b2e","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < 1c1b7e8e545ce65e40f65b55c432765e058ea98f","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < e8b784a3f4fba3ea9c4d05138ecfa784a069627f","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < e8315330e4ec09c0cac625515400e13d0ee22b81","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < 2940cc3cf43c72126b74ee6376314c195382023a","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < db09bc4ab19ce548a078240d2374792523953500","Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < f495b6c4c8594122918552c9be2b51eb71647cd9","Linux 5.1"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:20:45.758887Z"},"published":"2026-08-28","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:26:34.951Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80716","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"}],"tags":["cve.org"],"epss":0.00123,"epssPercentile":0.01862,"ingestedAt":"2026-10-16T19:46:24.303Z","slug":"CVE-2026-80716","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < c172e4c53321ee6429955295ea133bc3597a3ca9`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < 3035bb784cea3f338934f5042dd3f35225a51b2e`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < 1c1b7e8e545ce65e40f65b55c432765e058ea98f`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < e8b784a3f4fba3ea9c4d05138ecfa784a069627f`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < e8315330e4ec09c0cac625515400e13d0ee22b81`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < 2940cc3cf43c72126b74ee6376314c195382023a`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < db09bc4ab19ce548a078240d2374792523953500`\n- `Linux >= f57f3df03a8e6010e321fa0258d3e054713c3cb7 < f495b6c4c8594122918552c9be2b51eb71647cd9`\n- `Linux 5.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}