{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-74363", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74363", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-15T05:58:46.220Z", "updatedAt": "2026-10-16T18:55:35.622Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs", "summary": "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", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "e28616ca3d67e745ecb2f10eba4a626e1fc9a203", "status": "affected", "versionType": "git", "lessThan": "ea1c243c39e32b7fc1c2edfe32081ff7e30a877c" }, { "version": "743a620c661994c7f0938e6dd32fb0883fb1e0ea", "status": "affected", "versionType": "git", "lessThan": "5fecb71c10c28aef276ba49c718dc961745fdcf0" }, { "version": "b6e9645be9eb93f7aff3ca887f8edb6f1d63358f", "status": "affected", "versionType": "git", "lessThan": "c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2" }, { "version": "ee04cff9ed4d6bb25802f5cecfcd0750500410f3", "status": "affected", "versionType": "git", "lessThan": "53649846e0437d1d9b7cb993cfe54c367addf7ae" }, { "version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "status": "affected", "versionType": "git", "lessThan": "61f19729728243c82476dee31315143ed3275e7f" }, { "version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "status": "affected", "versionType": "git", "lessThan": "0497ff765746d9b2d17445c8f7cc737b36c0152a" }, { "version": "4f375ade6aa9f37fd72d7a78682f639772089eed", "status": "affected", "versionType": "git", "lessThan": "b93c55b4932dd7e32dca8cf34a3443cc87a02906" }, { "version": "de2d2baecc84cc7fca52eec2b9b55d89c93e3565", "status": "affected", "versionType": "git" }, { "version": "5.15.195", "status": "affected", "versionType": "semver", "lessThan": "5.15.212" }, { "version": "6.1.157", "status": "affected", "versionType": "semver", "lessThan": "6.1.178" }, { "version": "6.6.113", "status": "affected", "versionType": "semver", "lessThan": "6.6.145" }, { "version": "6.12.54", "status": "affected", "versionType": "semver", "lessThan": "6.12.97" }, { "version": "6.17.4", "status": "affected", "versionType": "semver", "lessThan": "6.18" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.18" }, { "version": "5.15.212", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.178", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.145", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.97", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.40", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }