{"api_version":"1","generated_at":"2026-08-15T08:45:47+00:00","cve":"CVE-2026-74363","urls":{"html":"https://cve.report/CVE-2026-74363","api":"https://cve.report/api/cve/CVE-2026-74363.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74363","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74363"},"summary":{"title":"bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from ->free_inode()\ninto ->destroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode->i_opflags (offset +2) inside current_time() -> is_mgtime().\n\nKASAN reports:\n  BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n  Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n  ->destroy_inode()  called immediately, can sleep, use for blocking\n                     cleanup e.g. bpf_any_put()\n  ->free_inode()     called after RCU grace period, use for freeing\n                     inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n  - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n    and needs to run promptly\n  - introduce bpf_free_inode() to handle kfree(i_link) and\n    free_inode_nonrcu() with proper RCU delay, preventing the UAF","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:37","updated_at":"2026-08-15 06:22:37"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/53649846e0437d1d9b7cb993cfe54c367addf7ae","name":"https://git.kernel.org/stable/c/53649846e0437d1d9b7cb993cfe54c367addf7ae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b93c55b4932dd7e32dca8cf34a3443cc87a02906","name":"https://git.kernel.org/stable/c/b93c55b4932dd7e32dca8cf34a3443cc87a02906","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/61f19729728243c82476dee31315143ed3275e7f","name":"https://git.kernel.org/stable/c/61f19729728243c82476dee31315143ed3275e7f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c","name":"https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2","name":"https://git.kernel.org/stable/c/c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5fecb71c10c28aef276ba49c718dc961745fdcf0","name":"https://git.kernel.org/stable/c/5fecb71c10c28aef276ba49c718dc961745fdcf0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0497ff765746d9b2d17445c8f7cc737b36c0152a","name":"https://git.kernel.org/stable/c/0497ff765746d9b2d17445c8f7cc737b36c0152a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74363","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74363","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e28616ca3d67e745ecb2f10eba4a626e1fc9a203 ea1c243c39e32b7fc1c2edfe32081ff7e30a877c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 743a620c661994c7f0938e6dd32fb0883fb1e0ea 5fecb71c10c28aef276ba49c718dc961745fdcf0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b6e9645be9eb93f7aff3ca887f8edb6f1d63358f c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ee04cff9ed4d6bb25802f5cecfcd0750500410f3 53649846e0437d1d9b7cb993cfe54c367addf7ae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/bpf/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ea1c243c39e32b7fc1c2edfe32081ff7e30a877c","status":"affected","version":"e28616ca3d67e745ecb2f10eba4a626e1fc9a203","versionType":"git"},{"lessThan":"5fecb71c10c28aef276ba49c718dc961745fdcf0","status":"affected","version":"743a620c661994c7f0938e6dd32fb0883fb1e0ea","versionType":"git"},{"lessThan":"c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2","status":"affected","version":"b6e9645be9eb93f7aff3ca887f8edb6f1d63358f","versionType":"git"},{"lessThan":"53649846e0437d1d9b7cb993cfe54c367addf7ae","status":"affected","version":"ee04cff9ed4d6bb25802f5cecfcd0750500410f3","versionType":"git"},{"lessThan":"61f19729728243c82476dee31315143ed3275e7f","status":"affected","version":"4f375ade6aa9f37fd72d7a78682f639772089eed","versionType":"git"},{"lessThan":"0497ff765746d9b2d17445c8f7cc737b36c0152a","status":"affected","version":"4f375ade6aa9f37fd72d7a78682f639772089eed","versionType":"git"},{"lessThan":"b93c55b4932dd7e32dca8cf34a3443cc87a02906","status":"affected","version":"4f375ade6aa9f37fd72d7a78682f639772089eed","versionType":"git"},{"status":"affected","version":"de2d2baecc84cc7fca52eec2b9b55d89c93e3565","versionType":"git"},{"lessThan":"5.15.212","status":"affected","version":"5.15.195","versionType":"semver"},{"lessThan":"6.1.178","status":"affected","version":"6.1.157","versionType":"semver"},{"lessThan":"6.6.145","status":"affected","version":"6.6.113","versionType":"semver"},{"lessThan":"6.12.97","status":"affected","version":"6.12.54","versionType":"semver"},{"lessThan":"6.18","status":"affected","version":"6.17.4","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"5.15.195","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"6.1.157","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.113","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"6.12.54","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from ->free_inode()\ninto ->destroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode->i_opflags (offset +2) inside current_time() -> is_mgtime().\n\nKASAN reports:\n  BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n  Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n  ->destroy_inode()  called immediately, can sleep, use for blocking\n                     cleanup e.g. bpf_any_put()\n  ->free_inode()     called after RCU grace period, use for freeing\n                     inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n  - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n    and needs to run promptly\n  - introduce bpf_free_inode() to handle kfree(i_link) and\n    free_inode_nonrcu() with proper RCU delay, preventing the UAF"}],"providerMetadata":{"dateUpdated":"2026-08-15T05:58:46.220Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c"},{"url":"https://git.kernel.org/stable/c/5fecb71c10c28aef276ba49c718dc961745fdcf0"},{"url":"https://git.kernel.org/stable/c/c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2"},{"url":"https://git.kernel.org/stable/c/53649846e0437d1d9b7cb993cfe54c367addf7ae"},{"url":"https://git.kernel.org/stable/c/61f19729728243c82476dee31315143ed3275e7f"},{"url":"https://git.kernel.org/stable/c/0497ff765746d9b2d17445c8f7cc737b36c0152a"},{"url":"https://git.kernel.org/stable/c/b93c55b4932dd7e32dca8cf34a3443cc87a02906"}],"title":"bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74363","datePublished":"2026-08-15T05:58:46.220Z","dateReserved":"2026-08-15T05:44:03.887Z","dateUpdated":"2026-08-15T05:58:46.220Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:37","lastModifiedDate":"2026-08-15 06:22:37","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74363","Ordinal":"1","Title":"bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs","CVE":"CVE-2026-74363","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74363","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from ->free_inode()\ninto ->destroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode->i_opflags (offset +2) inside current_time() -> is_mgtime().\n\nKASAN reports:\n  BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n  Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n  ->destroy_inode()  called immediately, can sleep, use for blocking\n                     cleanup e.g. bpf_any_put()\n  ->free_inode()     called after RCU grace period, use for freeing\n                     inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n  - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n    and needs to run promptly\n  - introduce bpf_free_inode() to handle kfree(i_link) and\n    free_inode_nonrcu() with proper RCU delay, preventing the UAF","Type":"Description","Title":"bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs"}]}}}