{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89634", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.739Z", "datePublished": "2026-09-11T19:45:28.823Z", "dateUpdated": "2026-09-11T19:45:28.823Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:45:28.823Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix ALIGN() overflow in symlink_data() error context loop\n\nThe check added by commit 7d9a7f1f96cd (\"smb/client: fix possible\ninfinite loop and oob read in symlink_data()\") compared the post-ALIGN\nlength against the remaining buffer, but ALIGN() itself can overflow:\nfor ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8)\nwraps to 0, so the subsequent bounds check passes, and the loop\nadvances by zero bytes leaving 'p' pointing into stale data.\n\nFix by checking the raw ErrorDataLength against the remaining space\nbefore applying ALIGN(), then checking again after. Since raw_len is\nbounded by the buffer, raw_len + 7 cannot overflow, so the second check\nis an exact post-alignment bounds guard."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2file.c"], "versions": [{"version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "657372ba6ea50b4474d2a6a610097eae8cd1f3e9", "status": "affected", "versionType": "git"}, {"version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "1f824f61d1df52392eaf0b74dfa5659d724fde30", "status": "affected", "versionType": "git"}, {"version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "62a3025983c8c735a3c6fc85a59316f31b59af07", "status": "affected", "versionType": "git"}, {"version": "76894f3e2f71177747b8b4763fb180e800279585", "lessThan": "62656b024efc21c3230eade1a847f25871c3d2bb", "status": "affected", "versionType": "git"}, {"version": "2d046892a493d9760c35fdaefc3017f27f91b621", "status": "affected", "versionType": "git"}, {"version": "6.0.16", "lessThan": "6.1", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2file.c"], "versions": [{"version": "6.1", "status": "affected"}, {"version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.1", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.3-rc1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9"}, {"url": "https://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30"}, {"url": "https://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07"}, {"url": "https://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb"}], "title": "smb: client: fix ALIGN() overflow in symlink_data() error context loop", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/smb2file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "657372ba6ea50b4474d2a6a610097eae8cd1f3e9", "status": "affected", "version": "76894f3e2f71177747b8b4763fb180e800279585", "versionType": "git"}, {"lessThan": "1f824f61d1df52392eaf0b74dfa5659d724fde30", "status": "affected", "version": "76894f3e2f71177747b8b4763fb180e800279585", "versionType": "git"}, {"lessThan": "62a3025983c8c735a3c6fc85a59316f31b59af07", "status": "affected", "version": "76894f3e2f71177747b8b4763fb180e800279585", "versionType": "git"}, {"lessThan": "62656b024efc21c3230eade1a847f25871c3d2bb", "status": "affected", "version": "76894f3e2f71177747b8b4763fb180e800279585", "versionType": "git"}, {"status": "affected", "version": "2d046892a493d9760c35fdaefc3017f27f91b621", "versionType": "git"}, {"lessThan": "6.1", "status": "affected", "version": "6.0.16", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/smb2file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.1"}, {"lessThan": "6.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nsmb: client: fix ALIGN() overflow in symlink_data() error context loop\n\nThe check added by commit 7d9a7f1f96cd (\"smb/client: fix possible\ninfinite loop and oob read in symlink_data()\") compared the post-ALIGN\nlength against the remaining buffer, but ALIGN() itself can overflow:\nfor ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8)\nwraps to 0, so the subsequent bounds check passes, and the loop\nadvances by zero bytes leaving 'p' pointing into stale data.\n\nFix by checking the raw ErrorDataLength against the remaining space\nbefore applying ALIGN(), then checking again after. Since raw_len is\nbounded by the buffer, raw_len + 7 cannot overflow, so the second check\nis an exact post-alignment bounds guard."}], "id": "CVE-2026-89634", "lastModified": "2026-09-11T20:19:49.010", "metrics": {}, "published": "2026-09-11T20:19:49.010", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: SMB client out-of-bounds read and denial of service via ALIGN() overflow", "id": "2532080", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532080"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Server Message Block (SMB) client within the Linux kernel. An integer overflow in the ALIGN() function, specifically within the symlink_data() error context loop, can lead to an out-of-bounds read. This issue allows a malicious SMB server to cause a denial of service (DoS) by triggering an infinite loop or potentially disclose sensitive information."], "name": "CVE-2026-89634", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:45:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89634\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89634\nhttps://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30\nhttps://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb\nhttps://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07\nhttps://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9"], "threat_severity": "Important"}

{}