159 lines
8.7 KiB
JSON
159 lines
8.7 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-2022-49172",
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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": "2025-02-26T01:49:39.279Z",
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"datePublished": "2025-02-26T01:55:28.628Z",
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"dateUpdated": "2026-08-05T08:54:14.479Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:54:14.479Z"
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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\nparisc: Fix non-access data TLB cache flush faults\n\nWhen a page is not present, we get non-access data TLB faults from\nthe fdc and fic instructions in flush_user_dcache_range_asm and\nflush_user_icache_range_asm. When these occur, the cache line is\nnot invalidated and potentially we get memory corruption. The\nproblem was hidden by the nullification of the flush instructions.\n\nThese faults also affect performance. With pa8800/pa8900 processors,\nthere will be 32 faults per 4 KB page since the cache line is 128\nbytes. There will be more faults with earlier processors.\n\nThe problem is fixed by using flush_cache_pages(). It does the flush\nusing a tmp alias mapping.\n\nThe flush_cache_pages() call in flush_cache_range() flushed too\nlarge a range.\n\nV2: Remove unnecessary preempt_disable() and preempt_enable() calls."
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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 flush_cache_mm/flush_cache_range paths are reached only via local memory-management operations (munmap, mremap, exit_mmap, tlb gather) on the attacker’s own address space, not via network or adjacent protocols.\nAC:L - An unprivileged process can reliably hit the vulnerable current-mm fast path (mm->context == mfsp(3)) with ordinary mmap/munmap/mremap of sparse mappings; no attacker-uncontrollable race or rare config is required.\nPR:L - Triggering requires only a normal unprivileged local account that can map and unmap its own memory; no root or init-namespace capabilities are needed.\nUI:N - The attacker triggers the flush path directly through their own syscalls; no separate victim action is required.\nS:U - Impact stays within the kernel’s single OS security authority (local memory corruption / possible privilege effects); this is not a VM escape or IOMMU boundary bypass.\nC:H - Failed invalidation on PA-RISC’s physically tagged caches can leave prior contents of a physical page readable after reuse by another process or the kernel, so the corruption is exploitable for information disclosure.\nI:H - The fix commit documents that nullified flushes leave cache lines not invalidated and can cause memory corruption, including stale dirty writebacks into reused pages and cross-mapping coherency failures.\nA:H - The resulting memory corruption reliably produces process crashes (and can destabilize other tasks or the kernel when freed pages are reused), matching High availability impact."
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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/parisc/kernel/cache.c"
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],
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"versions": [
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{
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"lessThan": "b3d6adb3a49d82e4e557c5fc16f50c9ff731da5d",
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"status": "affected",
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{
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],
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"versions": [
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"version": "2.6.12",
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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": "2.6.12",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "5.16.19",
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"lessThanOrEqual": "5.16.*",
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"status": "unaffected",
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},
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{
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"version": "5.17.2",
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"lessThanOrEqual": "5.17.*",
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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": "5.18",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b3d6adb3a49d82e4e557c5fc16f50c9ff731da5d"
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{
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"url": "https://git.kernel.org/stable/c/ddca4b82027e2a66333dd40fab21a4beff435c7e"
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"url": "https://git.kernel.org/stable/c/f839e5f1cef36ce268950c387129b1bfefdaebc9"
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}
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"title": "parisc: Fix non-access data TLB cache flush faults",
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