{"id":"CVE-2026-64156","state":"PUBLISHED","title":"netfs, afs: Fix write skipping in dir/link writepages","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs, afs: Fix write skipping in dir/link writepages\n\nFix netfs_write_single() and afs_single_writepages() to better handle a\nwrite that would be skipped due to lock contention and WB_SYNC_NONE by\nreturning 1 from netfs_write_single() if it skipped and making\nafs_single_writepages() skip also.  If a skip occurs, the inode must be\nre-marked as the VFS may have cleared the mark.\n\nThis is really only theoretical for directories in netfs_write_single() as\nthe only path to that is through afs_single_writepages() that takes the\n->validate_lock around it, thereby serialising it.","publishedAt":"2026-07-19T15:40:44.277Z","updatedAt":"2026-07-19T15:40:44.277Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6dd80936618c4ff852d4db73aca400351d9bd9f0","status":"affected","lessThan":"77bb293049d61e04c12b24ebbffafaf5ab36af90","versionType":"git"},{"version":"6dd80936618c4ff852d4db73aca400351d9bd9f0","status":"affected","lessThan":"f91e10435c0dd37c48b1b25e6236284f656ddc0c","versionType":"git"},{"version":"6dd80936618c4ff852d4db73aca400351d9bd9f0","status":"affected","lessThan":"9871938f99cc6cb266a77265491660e2375271f5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/dir.c","fs/netfs/write_issue.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/dir.c","fs/netfs/write_issue.c"]}],"references":["https://git.kernel.org/stable/c/77bb293049d61e04c12b24ebbffafaf5ab36af90","https://git.kernel.org/stable/c/f91e10435c0dd37c48b1b25e6236284f656ddc0c","https://git.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64156.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64156","state":"PUBLISHED","datePublished":"2026-07-19T15:40:44.277Z","dateUpdated":"2026-07-19T15:40:44.277Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.038Z"},"containers":{"cna":{"title":"netfs, afs: Fix write skipping in dir/link writepages","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs, afs: Fix write skipping in dir/link writepages\n\nFix netfs_write_single() and afs_single_writepages() to better handle a\nwrite that would be skipped due to lock contention and WB_SYNC_NONE by\nreturning 1 from netfs_write_single() if it skipped and making\nafs_single_writepages() skip also.  If a skip occurs, the inode must be\nre-marked as the VFS may have cleared the mark.\n\nThis is really only theoretical for directories in netfs_write_single() as\nthe only path to that is through afs_single_writepages() that takes the\n->validate_lock around it, thereby serialising it."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6dd80936618c4ff852d4db73aca400351d9bd9f0","status":"affected","lessThan":"77bb293049d61e04c12b24ebbffafaf5ab36af90","versionType":"git"},{"version":"6dd80936618c4ff852d4db73aca400351d9bd9f0","status":"affected","lessThan":"f91e10435c0dd37c48b1b25e6236284f656ddc0c","versionType":"git"},{"version":"6dd80936618c4ff852d4db73aca400351d9bd9f0","status":"affected","lessThan":"9871938f99cc6cb266a77265491660e2375271f5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/dir.c","fs/netfs/write_issue.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/dir.c","fs/netfs/write_issue.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/77bb293049d61e04c12b24ebbffafaf5ab36af90"},{"url":"https://git.kernel.org/stable/c/f91e10435c0dd37c48b1b25e6236284f656ddc0c"},{"url":"https://git.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T15:40:44.277Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}