CVE-2026-46100

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although AFS is a network filesystem, the vulnerable code path is reached via a local syscall, not via remote packet processing.\nAC:L - A local user reliably forces the leaking path by mmap'ing adjacent compatible regions to cause a VMA merge after .mmap_prepare; the merge and the subsequent fileserver-driven open_mmaps traversal are repeatable and within the attacker's control.\nPR:L - Exploitation requires only an unprivileged local account able to open and mmap a readable file on the AFS mount; no elevated capabilities are needed.\nUI:N - The attacker performs the mmap themselves; no action by another user is required (the AFS mount is environmental setup, not interaction).\nS:U - The corrupted vnode and the impacted callback-break code are all within the kernel's own security authority; no boundary such as VM/IOMMU is crossed.\nC:H - The leaked refcount leaves a freed afs_vnode linked on open_mmaps, and a subsequent callback-break traversal yields a use-after-free whose freed slab object can be controlled to enable arbitrary kernel memory disclosure.\nI:H - The use-after-free on the afs_vnode (afs_inode_cachep) permits heap spraying of attacker-controlled contents, providing a write primitive and potential control-flow hijack.\nA:H - The dangling list entry causes kernel oops/panic on the next callback-break traversal, and sustained triggering also leaks vnodes, so availability is fully impacted."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/file.c"], "versions": [{"version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79", "lessThan": "f51f85c044809fbd39ac8ae07ac99bc43ce32bd5", "status": "affected", "versionType": "git"}, {"version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79", "lessThan": "48c7a0eaeea41da17d1d84d2d7a4c40be122b246", "status": "affected", "versionType": "git"}, {"version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79", "lessThan": "fbfc6578eaca12daa0c09df1e9ba7f2c657b49da", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/file.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.17", "versionEndExcluding": "6.18.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f51f85c044809fbd39ac8ae07ac99bc43ce32bd5"}, {"url": "https://git.kernel.org/stable/c/48c7a0eaeea41da17d1d84d2d7a4c40be122b246"}, {"url": "https://git.kernel.org/stable/c/fbfc6578eaca12daa0c09df1e9ba7f2c657b49da"}], "title": "fs: afs: revert mmap_prepare() change", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/afs/file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f51f85c044809fbd39ac8ae07ac99bc43ce32bd5", "status": "affected", "version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79", "versionType": "git"}, {"lessThan": "48c7a0eaeea41da17d1d84d2d7a4c40be122b246", "status": "affected", "version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79", "versionType": "git"}, {"lessThan": "fbfc6578eaca12daa0c09df1e9ba7f2c657b49da", "status": "affected", "version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/afs/file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.27", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "210B8806-2626-4386-99C1-68429968DE90", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: afs: revert mmap_prepare() change\n\nPartially reverts commit 9d5403b1036c (\"fs: convert most other\ngeneric_file_*mmap() users to .mmap_prepare()\").\n\nThis is because the .mmap invocation establishes a refcount, but\n.mmap_prepare is called at a point where a merge or an allocation failure\nmight happen after the call, which would leak the refcount increment.\n\nFunctionality is being added to permit the use of .mmap_prepare in this\ncase, but in the interim, we need to fix this."}], "id": "CVE-2026-46100", "lastModified": "2026-06-25T21:18:03.243", "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": "2026-05-27T14:17:31.877", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/48c7a0eaeea41da17d1d84d2d7a4c40be122b246"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f51f85c044809fbd39ac8ae07ac99bc43ce32bd5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fbfc6578eaca12daa0c09df1e9ba7f2c657b49da"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs: afs: revert mmap_prepare() change", "id": "2481971", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481971"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's AFS (Andrew File System) component. The `mmap_prepare()` function was incorrectly used, leading to a reference count (refcount) leak. This issue occurs when `mmap_prepare()` establishes a refcount, but a subsequent operation fails, causing the refcount to be leaked. This resource leak could potentially lead to system instability or Denial of Service (DoS) over time."], "name": "CVE-2026-46100", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46100\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46100\nhttps://lore.kernel.org/linux-cve-announce/2026052705-CVE-2026-46100-fa8e@gregkh/T"]}

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