163 lines
9.0 KiB
JSON
163 lines
9.0 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-2026-80958",
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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": "2026-09-11T19:42:25.861Z",
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"dateUpdated": "2026-10-19T08:45:42.221Z"
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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": "2026-10-19T08:45:42.221Z"
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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: clamp the tail kset read to the segment data region\n\nThe tail-kset read in cache_replay(), the writeback worker and the GC\nworker bounds its length by PCACHE_SEG_SIZE - seg_off, the raw segment\nsize rather than the data region. A tail near the segment end reads past\nthe segment data into the following control area.\n\nClamp the read to cache_seg_remain(), the data region."
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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:N/A:H",
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"baseScore": 7.1,
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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 over-read is reached only through local device-mapper ioctls on /dev/mapper/control (ctl_ioctl requires CAP_SYS_ADMIN, then table_load → dm_pcache_ctr → pcache_cache_start → cache_replay), and later via the writeback and GC workers on that mapped device; no network, Bluetooth, or physical-bus input reaches the kset copy.\nAC:L - An attacker who supplies a crafted DAX/pmem cache image fully controls the persisted key_tail and dirty_tail, so placing a tail near the segment end deterministically copies past data_size; no race, heap layout, or other victim state outside attacker control is required.\nPR:L - dm-ioctl.c gates table load with capable(CAP_SYS_ADMIN), which user-namespace and privileged-container administrators satisfy without init-namespace root; the attacker can attach a DAX cache device they control and load the pcache table themselves.\nUI:N - Exploitation requires only the attacker's own dmsetup/DM_TABLE_LOAD of a crafted pcache cache device; no separate victim must mount media, open files, or take any other action.\nS:U - The out-of-bounds kset read and any resulting kernel oops remain inside the host kernel device-mapper/pcache subsystem; this is not a VM escape, IOMMU bypass, or other cross-authority breakout.\nC:H - copy_mc_to_kernel() copies up to PCACHE_KSET_ONMEDIA_SIZE_MAX (~5 KiB) past segment data_size into the next segment's control area, and on the last segment that continues beyond the DAX mapping into adjacent kernel memory; out-of-bounds reads are High unless limited to a few bytes.\nI:N - The destination is a correctly sized kset buffer (kzalloc or the writeback/GC scratch arrays); this is a source over-read, not an out-of-bounds write, use-after-free, or other kernel-memory corruption or control-flow hijack primitive.\nA:H - Reading past the last DAX-mapped page hits a vmap guard or unmapped hole and oopses the kernel, and a CRC-valid kset assembled across the data/control boundary that is larger than cache_seg_remain() hits BUG_ON in cache_pos_advance(), crashing 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_gc.c",
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"drivers/md/dm-pcache/cache_key.c",
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"drivers/md/dm-pcache/cache_writeback.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": "2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c",
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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": "1ab55354368d071ebaee4d8c82313955eab65a04",
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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": "becf07e2b0053027495ecd671b1f82fb2e615f68",
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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_gc.c",
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"drivers/md/dm-pcache/cache_key.c",
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"drivers/md/dm-pcache/cache_writeback.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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"negate": false,
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"cpeMatch": [
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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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"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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}
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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/2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c"
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},
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{
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"url": "https://git.kernel.org/stable/c/1ab55354368d071ebaee4d8c82313955eab65a04"
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},
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{
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"url": "https://git.kernel.org/stable/c/becf07e2b0053027495ecd671b1f82fb2e615f68"
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}
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],
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"title": "dm-pcache: clamp the tail kset read to the segment data region",
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