{"id":"CVE-2026-80856","state":"PUBLISHED","title":"fuse: fix invalidate lock leak on setattr writeback failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on setattr writeback failure\n\nfuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate\n(fault_blocked = true) and releases it at the out:/error: labels.  But\nwhen a writeback flush is also needed, a write_inode_now() failure\nreturns directly and leaks the lock, so any later fault or truncate on\nthe file stalls on the stale rwsem.\n\nFor example, truncate(2) on a setuid file reaches fuse_do_setattr()\nwith both ATTR_SIZE and ATTR_MODE set:\n\n  truncate(2)\n  └─ do_truncate()\n     ├─ dentry_needs_remove_privs()         # S_ISUID\n     └─ notify_change()                     # KILL_SUID -> ATTR_MODE\n        └─ fuse_setattr()                   # no killpriv:\n           │                                #   ia_valid |= ATTR_MODE\n           └─ fuse_do_setattr()\n              ├─ filemap_invalidate_lock()  # IS_DAX && is_truncate\n              └─ write_inode_now()          # is_wb && ATTR_MODE\n                 └─ if (err)                # e.g. daemon -> -EIO\n                    return err              # <- lock leaked\n\nFix this by adding an unlock label that releases the lock before\nreturning the error, and use it for the fuse_dax_break_layouts()\nfailure path as well.","publishedAt":"2026-09-04T15:55:09.250Z","updatedAt":"2026-10-30T12:31:18.058Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"92faaee1b108c6e4b07730d20896a6593a85f675","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"8f14906ce9103ab8f2f1ebda45935a0d61b9d763","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"03cfeeb135428fa83f0791d3f8f94d9298cae695","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"92588d187ba4697a322e7aefe5d9e538a87d1cd2","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"ea9fea370b8de4ffd72e0ef89550415c15637787","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"1758730d9eaa3c06cf415c3446d9f6eed9ed3eed","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"dd278d954c0e96a9cbd3cc491e07b8267d25f8d5","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"e8457ebfd77a46e8d1210e8888ea914ad064558e","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"9afeca0d569c9fc89d758fe7a9339d1e8afb1546","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dir.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dir.c"]}],"references":["https://git.kernel.org/stable/c/92faaee1b108c6e4b07730d20896a6593a85f675","https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763","https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695","https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2","https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787","https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed","https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5","https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e","https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80856.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80856","state":"PUBLISHED","datePublished":"2026-09-04T15:55:09.250Z","dateUpdated":"2026-10-30T12:31:18.058Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.797Z"},"containers":{"cna":{"title":"fuse: fix invalidate lock leak on setattr writeback failure","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on setattr writeback failure\n\nfuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate\n(fault_blocked = true) and releases it at the out:/error: labels.  But\nwhen a writeback flush is also needed, a write_inode_now() failure\nreturns directly and leaks the lock, so any later fault or truncate on\nthe file stalls on the stale rwsem.\n\nFor example, truncate(2) on a setuid file reaches fuse_do_setattr()\nwith both ATTR_SIZE and ATTR_MODE set:\n\n  truncate(2)\n  └─ do_truncate()\n     ├─ dentry_needs_remove_privs()         # S_ISUID\n     └─ notify_change()                     # KILL_SUID -> ATTR_MODE\n        └─ fuse_setattr()                   # no killpriv:\n           │                                #   ia_valid |= ATTR_MODE\n           └─ fuse_do_setattr()\n              ├─ filemap_invalidate_lock()  # IS_DAX && is_truncate\n              └─ write_inode_now()          # is_wb && ATTR_MODE\n                 └─ if (err)                # e.g. daemon -> -EIO\n                    return err              # <- lock leaked\n\nFix this by adding an unlock label that releases the lock before\nreturning the error, and use it for the fuse_dax_break_layouts()\nfailure path as well."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"92faaee1b108c6e4b07730d20896a6593a85f675","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"8f14906ce9103ab8f2f1ebda45935a0d61b9d763","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"03cfeeb135428fa83f0791d3f8f94d9298cae695","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"92588d187ba4697a322e7aefe5d9e538a87d1cd2","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"ea9fea370b8de4ffd72e0ef89550415c15637787","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"1758730d9eaa3c06cf415c3446d9f6eed9ed3eed","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"dd278d954c0e96a9cbd3cc491e07b8267d25f8d5","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"e8457ebfd77a46e8d1210e8888ea914ad064558e","versionType":"git"},{"version":"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f","status":"affected","lessThan":"9afeca0d569c9fc89d758fe7a9339d1e8afb1546","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dir.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dir.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/92faaee1b108c6e4b07730d20896a6593a85f675"},{"url":"https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763"},{"url":"https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695"},{"url":"https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2"},{"url":"https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787"},{"url":"https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed"},{"url":"https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5"},{"url":"https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e"},{"url":"https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:31:18.058Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.220"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.187"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.108"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.49"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.1.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}