346 lines
18 KiB
JSON
346 lines
18 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-2026-63875",
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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": "2026-07-19T07:54:57.017Z",
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"datePublished": "2026-07-19T14:54:48.842Z",
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"dateUpdated": "2026-10-19T20:17:53.723Z"
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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": "2026-08-05T12:36:48.899Z"
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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\narm64: tlb: Flush walk cache when unsharing PMD tables\n\nWhen huge_pmd_unshare() is called to unshare a PMD table, the\ntlb_unshare_pmd_ptdesc() function sets tlb->unshared_tables=true\nbut the aarch64 tlb_flush() only checked tlb->freed_tables to\ndetermine whether to use TLBF_NONE (vae1is, invalidates walk\ncache) or TLBF_NOWALKCACHE (vale1is, leaf-only).\n\nThis caused the stale PMD page table entry to remain in the walk cache\nafter unshare, potentially leading to incorrect page table walks.\n\nFix by including unshared_tables in the check, so that when\nunsharing tables, TLBF_NONE is used and the walk cache is properly\ninvalidated.\n\nHere is the detailed distinction between vae1is and vale1is:\n\n| Instruction Combination | Actual Invalidation Scope |\n| ------------------------ | --------------------------------------------------|\n| `VAE1IS` + TTL=`0` | All entries at all levels (full invalidation) |\n| `VAE1IS` + TTL=`2` (L2) | Non-leaf at Level 0/1 + leaf at Level 2 |\n| `VALE1IS` + TTL=`0` | Leaf entries at all levels (non-leaf not cleared) |\n| `VALE1IS` + TTL=`2` (L2) | Leaf entry at Level 2 only |"
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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 `tlb_flush()` path is only reached through local memory-management syscalls (mmap/munmap/mprotect/mremap/fork) operating on hugetlb VMAs, not through any network-facing kernel service.\nAC:L - An attacker fully controls the trigger sequence—creating shared hugetlbfs mappings (≥1GB PUD-aligned), forking to establish shared PMD tables, and concurrently unmapping/mprotecting/mremapping to force `huge_pmd_unshare()`—with no conditions outside their control.\nPR:L - Exploitation requires only an unprivileged local user capable of mapping shared hugetlb pages via hugetlbfs or SHM_HUGETLB, which is commonly available on arm64 database and container hosts with pre-reserved huge pages.\nUI:N - No victim interaction is required; the attacker sets up and triggers the stale walk-cache condition entirely within processes they control.\nS:U - Impact is confined to kernel memory-management within the same security authority (incorrect page-table walks and cross-mapping leakage within the kernel), not a VM escape or cross-authority boundary break.\nC:H - Stale non-leaf walk-cache entries after `pud_clear()` can cause incorrect page-table walks, enabling reads of memory that should be unmapped or mapped to different physical pages, constituting an arbitrary memory read primitive.\nI:H - Incorrect translations from stale PMD walk-cache entries can direct stores to unintended physical pages, and freed/reused page-table pages reached via stale cache entries provide a write/corruption primitive exploitable for control-flow hijacking.\nA:H - Stale walk-cache pointers to cleared or freed page-table structures can cause kernel faults, oops, or panics during page walks or concurrent GUP-fast access on the affected address space."
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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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"arch/arm64/include/asm/tlb.h"
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],
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"versions": [
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{
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"version": "6495204f8219a57859669d618b25d06176d5a872",
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"lessThan": "dced308d7d6a0de1c09d2058f38f1aaaf5cbb914",
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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": "ce4cf24761467756462c0e1dbe4a5e9c9eb520fc",
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"lessThan": "47490bbb05c8c0e09cc3cfd237d8934ffc340583",
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"status": "affected",
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"lessThan": "0199c9d57861f17b556b6cba1f765c7cce79745b",
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"lessThan": "c2ff4764e03e7a8d758352f4aceb8fe1be6ac971",
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"status": "affected",
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},
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"version": "5.10.253",
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"lessThan": "5.10.259",
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"status": "affected",
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"versionType": "semver"
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},
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"version": "5.15.203",
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"lessThan": "5.15.210",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.167",
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"lessThan": "6.1.176",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.127",
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"lessThan": "6.6.143",
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"status": "affected",
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},
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{
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"version": "6.12.74",
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"lessThan": "6.12.93",
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"status": "affected",
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},
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{
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"version": "6.18.13",
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"lessThan": "6.18.35",
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"status": "affected",
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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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"arch/arm64/include/asm/tlb.h"
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],
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{
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"version": "6.19",
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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": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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},
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"version": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.143",
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"version": "6.12.93",
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"status": "unaffected",
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},
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{
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"version": "6.18.35",
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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": "7.0.12",
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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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"cpeApplicability": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/dced308d7d6a0de1c09d2058f38f1aaaf5cbb914"
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},
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{
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},
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{
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"url": "https://git.kernel.org/stable/c/0199c9d57861f17b556b6cba1f765c7cce79745b"
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},
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{
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"url": "https://git.kernel.org/stable/c/d766a49d9b55705c4737cd8bb5d3faa2d31330fd"
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},
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{
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"url": "https://git.kernel.org/stable/c/8ca7284da0e67b3e71d90ec17f08286774245ad9"
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},
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{
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"url": "https://git.kernel.org/stable/c/fe93e907b1af03cc229a80aa64a570a103d2b279"
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{
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"url": "https://git.kernel.org/stable/c/48125cd9c55cbe297b59fd1f9bda48b0960bd181"
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},
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{
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"url": "https://git.kernel.org/stable/c/c2ff4764e03e7a8d758352f4aceb8fe1be6ac971"
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}
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],
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"title": "arm64: tlb: Flush walk cache when unsharing PMD tables",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-63875",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:32:42.432974Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-459",
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"description": "CWE-459 Incomplete Cleanup"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T20:17:53.723Z"
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}
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}
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]
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}
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} |