CVE-2026-74592

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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\u2014via local truncate/ftruncate or an authenticated ksmbd/NFS client with write ACL\u2014not 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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74592", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:38.240831Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:59.525Z"}}]}}

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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\u2014via local truncate/ftruncate or an authenticated ksmbd/NFS client with write ACL\u2014not 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; 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{"bugzilla": {"description": "kernel: ima: Instantiate file_truncate and path_truncate hooks", "id": "2521488", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521488"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-222", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nima: Instantiate file_truncate and path_truncate hooks\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.", "A flaw was found in the Linux kernel's Integrity Measurement Architecture (IMA). When a file is truncated, the system's integrity policy hooks are not properly instantiated, preventing the action cache flags from being reset. This oversight means that after truncation, the file is not re-collected, re-measured, re-audited, and re-appraised on subsequent access, potentially allowing an attacker to bypass integrity checks."], "name": "CVE-2026-74592", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74592\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74592\nhttps://lore.kernel.org/linux-cve-announce/2026082213-CVE-2026-74592-c153@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,5f46705d96eb60587aa7035acfcbec977e08d620)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,dd21c96a71e876c8df9ec546b885a2c5f47bbb05)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0baed1fa2184c81e4baf76f445d3faa4b738c8f7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b80bed5c871a80151351342c065579405ce77145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.104)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.45)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.1.9)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T17:45:02.787857+00:00", "updated": "2026-08-25T17:45:04.933484+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}