138 lines
7.8 KiB
JSON
138 lines
7.8 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-2026-43106",
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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": "2026-05-01T14:12:55.986Z",
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"datePublished": "2026-05-06T07:40:34.365Z",
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"dateUpdated": "2026-08-05T12:25:56.425Z"
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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": "2026-08-05T12:25:56.425Z"
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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\ncachefiles: fix incorrect dentry refcount in cachefiles_cull()\n\nThe patch mentioned below changed cachefiles_bury_object() to expect 2\nreferences to the 'rep' dentry. Three of the callers were changed to\nuse start_removing_dentry() which takes an extra reference so in those\ncases the call gets the expected references.\n\nHowever there is another call to cachefiles_bury_object() in\ncachefiles_cull() which did not need to be changed to use\nstart_removing_dentry() and so was not properly considered.\nIt still passed the dentry with just one reference so the net result is\nthat a reference is lost.\n\nTo meet the expectations of cachefiles_bury_object(), cachefiles_cull()\nmust take an extra reference before the call. It will be dropped by\ncachefiles_bury_object()."
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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 vulnerable path is reached through local CacheFiles/cachefilesd activity and the `/dev/cachefiles` control interface, not by directly processing remote packets.\nAC:L - The refcount bug is deterministic once a cull operation reaches `cachefiles_cull()`; there is no attacker-uncontrolled race required, and cache pressure/cullable objects can be induced in a normal CacheFiles-backed deployment.\nPR:L - Directly opening `/dev/cachefiles` requires init-namespace `CAP_SYS_ADMIN`, but culling is normally performed by the privileged cachefilesd daemon in response to cache pressure. A local unprivileged user with access to a CacheFiles-backed mount can plausibly create cache pressure and cullable objects that cause the daemon to trigger the vulnerable command.\nUI:N - No victim user action is required once the attacker can generate the local cache activity; cachefilesd culling is daemon-driven.\nS:U - The vulnerability corrupts kernel/VFS state within the same operating-system security authority and does not cross a VM, IOMMU, or similar boundary.\nC:H - The missing extra dentry reference can produce a use-after-free/double-put on a kernel dentry. Under the required kernel guidance, UAF memory corruption is scored as capable of high confidentiality impact.\nI:H - The freed dentry can be reused while still dereferenced or put again, making this kernel memory corruption. Under the required guidance, UAFs are treated as potentially enabling arbitrary write/control-flow impact.\nA:H - The dentry refcount loss can lead to use-after-free, refcount underflow, or invalid dput paths in the kernel. Such corruption can reliably crash or oops the kernel, so availability impact is high."
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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/cachefiles/namei.c"
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],
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"versions": [
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{
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"version": "7bb1eb45e43c4730cbc5a48b9e9295049fccdacb",
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"lessThan": "6577df7dc7a7de128442b6192c7a32195c923480",
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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": "7bb1eb45e43c4730cbc5a48b9e9295049fccdacb",
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"lessThan": "1635c2acdde86c4f555b627aec873c8677c421ed",
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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/cachefiles/namei.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "6.19.14",
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"lessThanOrEqual": "6.19.*",
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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",
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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": "6.19",
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"versionEndExcluding": "6.19.14"
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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": "6.19",
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"versionEndExcluding": "7.0"
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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/6577df7dc7a7de128442b6192c7a32195c923480"
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},
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{
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"url": "https://git.kernel.org/stable/c/1635c2acdde86c4f555b627aec873c8677c421ed"
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}
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],
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"title": "cachefiles: fix incorrect dentry refcount in cachefiles_cull()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |