159 lines
8.3 KiB
JSON
159 lines
8.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-46100",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.097Z",
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"datePublished": "2026-05-27T12:59:06.853Z",
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"dateUpdated": "2026-08-05T12:29:37.582Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:29:37.582Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The refcount leak is set up by a local mmap() syscall on a file in a mounted AFS volume; 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/afs/file.c"
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],
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"versions": [
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{
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"version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79",
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"lessThan": "f51f85c044809fbd39ac8ae07ac99bc43ce32bd5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79",
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"lessThan": "48c7a0eaeea41da17d1d84d2d7a4c40be122b246",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79",
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"lessThan": "fbfc6578eaca12daa0c09df1e9ba7f2c657b49da",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/afs/file.c"
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],
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"versions": [
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{
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"version": "6.17",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.17",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.27",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.4",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "6.18.27"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "7.0.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f51f85c044809fbd39ac8ae07ac99bc43ce32bd5"
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},
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{
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"url": "https://git.kernel.org/stable/c/48c7a0eaeea41da17d1d84d2d7a4c40be122b246"
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},
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{
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"url": "https://git.kernel.org/stable/c/fbfc6578eaca12daa0c09df1e9ba7f2c657b49da"
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}
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],
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"title": "fs: afs: revert mmap_prepare() change",
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