{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-98116", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98116", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-25T10:36:01.723Z", "updatedAt": "2026-10-19T09:14:08.504Z", "importedAt": "2026-10-24T01:58:41.756Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF", "summary": "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->buffer_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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "33061d0fba51d2bf70a2ef9645f703c33fe8e438", "status": "affected", "versionType": "git", "lessThan": "e6cdd2a0470d64073349a970dc1691433804b271" }, { "version": "92ee3c60ec9fe64404dc035e7c41277d74aa26cb", "status": "affected", "versionType": "git", "lessThan": "9857a75714bb5df4781e4d8b1a1753b1e17bf07a" }, { "version": "92ee3c60ec9fe64404dc035e7c41277d74aa26cb", "status": "affected", "versionType": "git", "lessThan": "cbadf2575d25e7dcc0d4da2717817ae569fbc99b" }, { "version": "92ee3c60ec9fe64404dc035e7c41277d74aa26cb", "status": "affected", "versionType": "git", "lessThan": "cbc7ec97601d09b74e05e44470fa6b0bcdabf3f5" }, { "version": "92ee3c60ec9fe64404dc035e7c41277d74aa26cb", "status": "affected", "versionType": "git", "lessThan": "fd137bf8149bc6460f9b7b1fc292025da04cb9ee" }, { "version": "92ee3c60ec9fe64404dc035e7c41277d74aa26cb", "status": "affected", "versionType": "git", "lessThan": "8c1882dfee8f404d118020664b73eb4592172226" }, { "version": "92ee3c60ec9fe64404dc035e7c41277d74aa26cb", "status": "affected", "versionType": "git", "lessThan": "9b110a9dcecc59516c77cb3c0caf1f492f75df2d" }, { "version": "a42aa926843acca96c0dfbde2e835b8137f2f092", "status": "affected", "versionType": "git" }, { "version": "9cb6c40a6ebe4a0cfc9d6a181958211682cffea9", "status": "affected", "versionType": "git" }, { "version": "fbeb492694ce0441053de57699e1e2b7bc148a69", "status": "affected", "versionType": "git" }, { "version": "0f6947f5f5208f6ebd4d76a82a4757e2839a23f8", "status": "affected", "versionType": "git" }, { "version": "0090c13cbbdffd7da079ac56f80373a9a1be0bf8", "status": "affected", "versionType": "git" }, { "version": "1bbf82d9f961414d6c76a08f7f843ea068e0ab7b", "status": "affected", "versionType": "git" }, { "version": "5.15.32", "status": "affected", "versionType": "semver", "lessThan": "5.15.222" }, { "version": "4.14.279", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.243", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.193", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.10.109", "status": "affected", "versionType": "semver", "lessThan": "5.11" }, { "version": "5.16.18", "status": "affected", "versionType": "semver", "lessThan": "5.17" }, { "version": "5.17.1", "status": "affected", "versionType": "semver", "lessThan": "5.18" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.18" }, { "version": "5.15.222", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.189", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.158", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.111", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.53", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }