CVE-2026-74399

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["security/integrity/evm/evm_secfs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8df81954d22a653a8b01d46692cd56f71137269b", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}, {"lessThan": "0b9f8282b40af4a99d6243d2cb939d14ff36b049", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}, {"lessThan": "a36cbfb85f26e6c6fb6529b1a364331b94dc88f3", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}, {"lessThan": "12ad52dc45a0c8c9d25e85b4a84201de4c5420ed", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}, {"lessThan": "a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}, {"lessThan": "38b7d63b23aa9d2ddde7688040e9426d32be4065", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}, {"lessThan": "11143a19f5b8dc8f414deab87571134f9f447313", "status": "affected", "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["security/integrity/evm/evm_secfs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"lessThan": "4.18", "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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nevm: terminate and bound the evm_xattrs read buffer\n\nevm_read_xattrs() allocates size + 1 bytes, fills them from the list of\nenabled xattrs, and then passes strlen(temp) to\nsimple_read_from_buffer(). When no configured xattrs are enabled, the\nfill loop stores nothing and temp[0] remains uninitialized, so strlen()\nreads beyond initialized memory.\n\nExplicitly terminate the buffer after allocation, use snprintf() for\neach formatted line, and pass the accumulated length, without risk of\ntruncation, to simple_read_from_buffer()."}], "id": "CVE-2026-74399", "lastModified": "2026-11-06T17:19:47.673", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74399", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:56:55.812669Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:41.917", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b9f8282b40af4a99d6243d2cb939d14ff36b049"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11143a19f5b8dc8f414deab87571134f9f447313"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/12ad52dc45a0c8c9d25e85b4a84201de4c5420ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/38b7d63b23aa9d2ddde7688040e9426d32be4065"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8df81954d22a653a8b01d46692cd56f71137269b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a36cbfb85f26e6c6fb6529b1a364331b94dc88f3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: evm: terminate and bound the evm_xattrs read buffer", "id": "2516821", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516821"}, "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-125", "details": ["A flaw was found in the Linux kernel's Extended Verification Module (EVM). The `evm_read_xattrs()` function, when processing extended attributes, fails to properly initialize a buffer. This can lead to an out-of-bounds read when no extended attributes are configured, potentially allowing an attacker to cause a denial of service (DoS) or disclose sensitive information."], "name": "CVE-2026-74399", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74399\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74399\nhttps://lore.kernel.org/linux-cve-announce/2026081508-CVE-2026-74399-4e03@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,8df81954d22a653a8b01d46692cd56f71137269b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,0b9f8282b40af4a99d6243d2cb939d14ff36b049)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,a36cbfb85f26e6c6fb6529b1a364331b94dc88f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,12ad52dc45a0c8c9d25e85b4a84201de4c5420ed)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,38b7d63b23aa9d2ddde7688040e9426d32be4065)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa516b66a1bfce1d72f1620c54bdfebc493000d1,11143a19f5b8dc8f414deab87571134f9f447313)"}}], "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": "affected", "versions": {"scheme": "generic", "value": "4.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T16:15:03.533811+00:00", "updated": "2026-08-22T02:00:17.901521+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}