159 lines
8.8 KiB
JSON
159 lines
8.8 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-2026-80959",
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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": "2026-08-26T14:34:25.809Z",
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"datePublished": "2026-09-11T19:42:26.514Z",
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"dateUpdated": "2026-10-19T08:45:43.213Z"
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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": "2026-10-19T08:45:43.213Z"
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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\ndm-pcache: bound the persisted tail-position offset\n\ncache_pos_decode() takes the persisted key_tail and dirty_tail seg_off from\nthe cache device and addresses within the segment with it. A seg_off at or\npast the segment data_size, controllable by whoever supplies the device\n(CAP_SYS_ADMIN), reads past the segment data.\n\nReject a decoded seg_off that is not below the segment data_size."
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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 unbounded tail offset is consumed only when a local caller loads a dm-pcache table (ctl_ioctl → table_load → dm_pcache_ctr → pcache_cache_start → cache_tail_init → cache_pos_decode) from a supplied DAX cache device; no network, Bluetooth, or USB receive path parses this metadata.\nAC:L - The attacker fully controls the cache device and can forge key_tail/dirty_tail pos_onmedia with a valid CRC (public PCACHE_CRC_SEED), so cache_pos_decode() deterministically accepts an out-of-range seg_off; no race or uninfluenced victim state is required.\nPR:L - dm-ioctl.c gates table load with capable(CAP_SYS_ADMIN); kernel-CNA scoring treats that delegated capability (privileged containers, LVM/storage helpers) as Low rather than exclusive init-namespace root, and the attacker supplies the cache/backing devices on the pcache table.\nUI:N - The attacker performs every step itself: craft the persisted tail positions on a DAX cache device and issue DM_TABLE_LOAD for a pcache target; no other user must mount media, open files, or otherwise interact.\nS:U - The out-of-bounds pmem/kernel access and resulting oops stay inside the host kernel device-mapper/pcache mapping; this is not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - cache_replay(), writeback and GC copy ksets via copy_mc_to_kernel from cache_pos_addr() (segment.data plus the attacker-controlled u32 seg_off) for up to PCACHE_KSET_ONMEDIA_SIZE_MAX bytes, an unbounded over-read past segment data into later pmem or adjacent kernel VA, not a few-byte leak.\nI:H - A seg_off at data_size makes append_last_kset() memcpy_flushcache a kset into the next 16MiB segment's control metadata; a larger seg_off underflows u32 cache_seg_remain() so later key-head writes become arbitrary-offset stores through the DAX mapping, an out-of-bounds write primitive.\nA:H - cache_pos_advance() hits BUG_ON(cache_seg_remain(pos) < len) when a tail sits at data_size, and a huge seg_off makes copy_mc_to_kernel/memcpy_flushcache walk off the DAX mapping into unmapped kernel VA, oopsing or panicking the host."
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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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"drivers/md/dm-pcache/cache.c"
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],
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"versions": [
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{
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"version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
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"lessThan": "ffd9a214a94f9928e54856f42b1cc3e33fb10e36",
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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": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
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"lessThan": "8bf7a06ca3c1611809725f58cfd573f2ffbda75f",
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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": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
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"lessThan": "d1898576090a10d2ac2715218a652e78fb65a6b0",
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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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"drivers/md/dm-pcache/cache.c"
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],
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"versions": [
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{
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"version": "6.18",
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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": "6.18",
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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": "6.18.50",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "6.18",
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"versionEndExcluding": "6.18.50"
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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": "6.18",
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"versionEndExcluding": "7.2.4"
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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": "6.18",
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"versionEndExcluding": "7.3"
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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/ffd9a214a94f9928e54856f42b1cc3e33fb10e36"
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},
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{
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"url": "https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0"
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}
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],
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"title": "dm-pcache: bound the persisted tail-position offset",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |