{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-98116","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2026-09-25T11:17:42.780","lastModified":"2026-10-28T16:10:22.600","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF\n\nsnd_pcm_hw_params() and snd_pcm_hw_free() guard buffer reallocation\nwith an mmap_count check performed under the PCM stream lock, but the\nlock is released long before the buffer is actually freed:\nsnd_pcm_sync_stop(), constraint refinement and do_free_pages() all\nhappen in between.  snd_pcm_mmap_data(), on the other hand, takes no\nlock at all: it validates against the old buffer's state and\ndma_bytes, remaps its pages into the VMA, and only then increments\nmmap_count.\n\nA concurrent mmap() can therefore slip in between the check and the\nfree.  remap_pfn_range() installs writable PTEs for the old buffer's\npages without taking page references, and the subsequent\ndo_free_pages() returns those pages to the page allocator while the\nVMA still maps them.  This leaves a stale, writable mapping of freed\npages: a page-level use-after-free that can be leveraged for local\nprivilege escalation.\n\nMake snd_pcm_mmap_data() participate in the buffer-access scheme\nintroduced for hw_params/hw_free: acquire runtime-\u003ebuffer_accessing\nbefore validating and remapping, and release it afterwards.  Buffer\nreallocation already fails with -EBUSY while accessors are active,\nand the mmap side now fails with -EBUSY while a reallocation is in\nprogress, so the validate/remap sequence and the check/free sequence\ncan no longer interleave.\n\nA reproducer that turns this race into a stale writable mapping of\nthe freed DMA buffer pages is available on request."}],"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":"33061d0fba51d2bf70a2ef9645f703c33fe8e438","lessThan":"e6cdd2a0470d64073349a970dc1691433804b271","versionType":"git","status":"affected"},{"version":"92ee3c60ec9fe64404dc035e7c41277d74aa26cb","lessThan":"9857a75714bb5df4781e4d8b1a1753b1e17bf07a","versionType":"git","status":"affected"},{"version":"92ee3c60ec9fe64404dc035e7c41277d74aa26cb","lessThan":"cbadf2575d25e7dcc0d4da2717817ae569fbc99b","versionType":"git","status":"affected"},{"version":"92ee3c60ec9fe64404dc035e7c41277d74aa26cb","lessThan":"cbc7ec97601d09b74e05e44470fa6b0bcdabf3f5","versionType":"git","status":"affected"},{"version":"92ee3c60ec9fe64404dc035e7c41277d74aa26cb","lessThan":"fd137bf8149bc6460f9b7b1fc292025da04cb9ee","versionType":"git","status":"affected"},{"version":"92ee3c60ec9fe64404dc035e7c41277d74aa26cb","lessThan":"8c1882dfee8f404d118020664b73eb4592172226","versionType":"git","status":"affected"},{"version":"92ee3c60ec9fe64404dc035e7c41277d74aa26cb","lessThan":"9b110a9dcecc59516c77cb3c0caf1f492f75df2d","versionType":"git","status":"affected"},{"version":"a42aa926843acca96c0dfbde2e835b8137f2f092","versionType":"git","status":"affected"},{"version":"9cb6c40a6ebe4a0cfc9d6a181958211682cffea9","versionType":"git","status":"affected"},{"version":"fbeb492694ce0441053de57699e1e2b7bc148a69","versionType":"git","status":"affected"},{"version":"0f6947f5f5208f6ebd4d76a82a4757e2839a23f8","versionType":"git","status":"affected"},{"version":"0090c13cbbdffd7da079ac56f80373a9a1be0bf8","versionType":"git","status":"affected"},{"version":"1bbf82d9f961414d6c76a08f7f843ea068e0ab7b","versionType":"git","status":"affected"},{"version":"5.15.32","lessThan":"5.15.222","versionType":"semver","status":"affected"},{"version":"4.14.279","lessThan":"4.15","versionType":"semver","status":"affected"},{"version":"4.19.243","lessThan":"4.20","versionType":"semver","status":"affected"},{"version":"5.4.193","lessThan":"5.5","versionType":"semver","status":"affected"},{"version":"5.10.109","lessThan":"5.11","versionType":"semver","status":"affected"},{"version":"5.16.18","lessThan":"5.17","versionType":"semver","status":"affected"},{"version":"5.17.1","lessThan":"5.18","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":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","versionType":"semver","status":"unaffected"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","versionType":"semver","status":"unaffected"},{"version":"7.3","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}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-416"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.279","versionEndExcluding":"4.15","matchCriteriaId":"74A30740-4A22-4010-9DE2-ECC961DA4E1F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.243","versionEndExcluding":"4.20","matchCriteriaId":"377B69E2-76BA-4327-8D8D-9E978D218DFC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.193","versionEndExcluding":"5.5","matchCriteriaId":"AFD473DD-DFA3-44BB-B228-3D4572832AF3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.109","versionEndExcluding":"5.11","matchCriteriaId":"B08717F2-D179-40D5-9380-75A360456651"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStart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