{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74592","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.919Z","datePublished":"2026-08-22T15:31:43.419Z","dateUpdated":"2026-08-25T05:40:20.017Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-25T05:40:20.017Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nima: Instantiate file_truncate and path_truncate hooks\n\nInstantiate the file_truncate and path_truncate LSM hooks to reset the\naction cache flags (IMA_DONE_MASK) as soon as truncation is requested,\nso the file, based on policy, is re-collected, re-measured, re-audited,\nand re-appraised on next access."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The missing IMA hook is hit from vfs_truncate() via truncate/ftruncate/O_TRUNC syscalls and from ksmbd vfs_truncate on TCP/445; on IMA-enforced servers a remote SMB client with write access can truncate appraised files without clearing IMA_DONE_MASK, the highest-impact reachable path.\nAC:L - Once IMA policy is active, an attacker with write access can deterministically truncate a target file; security_path_truncate/file_truncate always run before do_truncate, so stale IMA_DONE_MASK persists reliably with no races or special memory layout.\nPR:L - Exploitation requires only standard file write permission (MAY_WRITE) on the target inode—via local truncate/ftruncate or an authenticated ksmbd/NFS client with write ACL—not real root or init-namespace capabilities beyond normal write access to the appraised file.\nUI:N - The attacker directly issues truncate/ftruncate or remote SETATTR/truncate operations; no victim must mount media, open a file, or perform any separate action beyond the attacker's own write/truncate request.\nS:U - The flaw defeats IMA measurement/appraisal caching within the same kernel integrity authority; it does not cross VM, hypervisor, IOMMU, or container sandbox boundaries.\nC:H - Stale IMA_APPRAISED flags let process_measurement() skip re-appraisal on exec/open, so attacker-modified truncated content in hash-appraised executables runs with a cached pass and can access any data reachable by that code.\nI:H - Without clearing IMA_DONE_MASK on truncation, modified file content retains cached IMA_MEASURED/IMA_APPRAISED state and bypasses re-measurement, re-audit, and re-appraisal, defeating the core IMA integrity guarantee for affected files.\nA:N - The bug is a stale-cache integrity bypass with no kernel memory corruption, oops, panic, hang, or deadlock; truncation may change individual file availability but does not inherently crash or deny the host kernel."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/integrity/ima/ima_main.c"],"versions":[{"version":"3323eec921efd815178a23107ab63588c605c0b2","lessThan":"5f46705d96eb60587aa7035acfcbec977e08d620","status":"affected","versionType":"git"},{"version":"3323eec921efd815178a23107ab63588c605c0b2","lessThan":"dd21c96a71e876c8df9ec546b885a2c5f47bbb05","status":"affected","versionType":"git"},{"version":"3323eec921efd815178a23107ab63588c605c0b2","lessThan":"0baed1fa2184c81e4baf76f445d3faa4b738c8f7","status":"affected","versionType":"git"},{"version":"3323eec921efd815178a23107ab63588c605c0b2","lessThan":"b80bed5c871a80151351342c065579405ce77145","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/integrity/ima/ima_main.c"],"versions":[{"version":"2.6.30","status":"affected"},{"version":"0","lessThan":"2.6.30","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5f46705d96eb60587aa7035acfcbec977e08d620"},{"url":"https://git.kernel.org/stable/c/dd21c96a71e876c8df9ec546b885a2c5f47bbb05"},{"url":"https://git.kernel.org/stable/c/0baed1fa2184c81e4baf76f445d3faa4b738c8f7"},{"url":"https://git.kernel.org/stable/c/b80bed5c871a80151351342c065579405ce77145"}],"title":"ima: Instantiate file_truncate and path_truncate hooks","x_generator":{"engine":"bippy-1.2.0"}}}}