CVE-2026-98116

{"id": "CVE-2026-98116", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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"}], "programFiles": ["sound/core/pcm_native.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"status": "unaffected", "version": "0", "lessThan": "5.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.222", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.189", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.158", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.111", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.53", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.7", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["sound/core/pcm_native.c"], "defaultStatus": "affected"}]}], "published": "2026-09-25T11:17:42.780", "references": [{"url": "https://git.kernel.org/stable/c/8c1882dfee8f404d118020664b73eb4592172226", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9857a75714bb5df4781e4d8b1a1753b1e17bf07a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9b110a9dcecc59516c77cb3c0caf1f492f75df2d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cbadf2575d25e7dcc0d4da2717817ae569fbc99b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cbc7ec97601d09b74e05e44470fa6b0bcdabf3f5", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e6cdd2a0470d64073349a970dc1691433804b271", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fd137bf8149bc6460f9b7b1fc292025da04cb9ee", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "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->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."}], "lastModified": "2026-10-28T16:10:22.600", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "74A30740-4A22-4010-9DE2-ECC961DA4E1F", "versionEndExcluding": "4.15", "versionStartIncluding": "4.14.279"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "377B69E2-76BA-4327-8D8D-9E978D218DFC", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.243"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AFD473DD-DFA3-44BB-B228-3D4572832AF3", "versionEndExcluding": "5.5", "versionStartIncluding": "5.4.193"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B08717F2-D179-40D5-9380-75A360456651", "versionEndExcluding": "5.11", "versionStartIncluding": "5.10.109"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AF7A01DF-61B5-4270-AD0E-63B8C4DD81F0", "versionEndExcluding": "5.15.222", "versionStartIncluding": "5.15.32"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13C4237C-3C38-4C41-BFB6-8BD2D9EF33BF", "versionEndIncluding": "5.17.1", "versionStartIncluding": "5.16.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "47BC31C9-3D9E-4B96-B5F8-291D6AD55D81", "versionEndExcluding": "6.12.111", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7561AABB-6D5A-4324-BC66-C6C6B012AFD8", "versionEndExcluding": "6.18.53", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "19917B2D-B4B2-4416-A482-9C7C4929A921", "versionEndExcluding": "7.2.7", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "11E35E1B-5DB4-4AB9-9706-CD73B799EADF"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}