122 lines
6.5 KiB
JSON
122 lines
6.5 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-2026-90096",
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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": "2026-09-11T19:38:34.786Z",
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"datePublished": "2026-09-17T16:06:08.870Z",
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"dateUpdated": "2026-10-19T08:57:54.506Z"
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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": "2026-10-19T08:57:54.506Z"
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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\nfuse: invalidate the correct range after O_APPEND direct write\n\nfuse_direct_write_iter() captures pos before generic_write_checks(),\nwhich moves ki_pos to EOF for O_APPEND writes:\n\n fuse_direct_write_iter()\n {\n pos = iocb->ki_pos; /* 0 (user-supplied) */\n generic_write_checks(); /* ki_pos -> EOF */\n fuse_direct_io(); /* writes at EOF, correct */\n invalidate(pos, pos + res); /* [0, res) -- wrong */\n }\n\nThe post-write invalidation targets a stale range instead of the\nactual written range at EOF.\n\nThis can cause data inconsistency when the file size is not\npage-aligned. The tail page straddling EOF has a valid portion\nbefore EOF that concurrent readers can fault back in during the\nDIO write window:\n\n Tail page (file size X not page-aligned):\n\n page_start X (EOF) page_end\n |--- valid data ----|-- stale --|\n\n CPU0 (O_APPEND DIO writer) CPU1 (buffered reader)\n -------------------------- ----------------------\n invalidate [X, X+len)\n tail page evicted\n FUSE_WRITE in flight ...\n read [page_start, X)\n tail page re-faulted\n [X, page_end) = stale\n FUSE_WRITE completes\n i_size = X + len\n invalidate [0, len) <- WRONG\n tail page still cached\n read [X, X+len)\n hits stale tail page\n returns old data\n\nFix by reading pos back from iocb->ki_pos after generic_write_checks(),\nas generic_file_direct_write() does.\n\nAlso fix a typo in the comment (\"may have\" -> \"may have competed\")."
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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/fuse/file.c"
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],
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"versions": [
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{
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"version": "2b0408d0284f4ff376cf5610fa8c9905e93c2541",
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"lessThan": "833963069adf86dcbdffd4e7d7b3171f95070b77",
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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": "2b0408d0284f4ff376cf5610fa8c9905e93c2541",
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"lessThan": "26d7e1f5c407b5859122b5cd47d7ebbf4b4c1cd2",
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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/fuse/file.c"
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],
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"versions": [
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{
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"version": "7.2",
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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": "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": "7.2.6",
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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": "7.2",
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"versionEndExcluding": "7.2.6"
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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": "7.2",
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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/833963069adf86dcbdffd4e7d7b3171f95070b77"
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},
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{
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"url": "https://git.kernel.org/stable/c/26d7e1f5c407b5859122b5cd47d7ebbf4b4c1cd2"
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}
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],
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"title": "fuse: invalidate the correct range after O_APPEND direct write",
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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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} |