{"id":"CVE-2026-89636","title":"kernel: smb: client: clear ce->tgthint in free_tgts() (CVE-2026-89636)","summary":"A flaw was found in the Linux kernel's Server Message Block (SMB) client. When the `free_tgts()` function frees data structures, a pointer (`ce->tgthint`) is not properly reset, leaving it pointing to a memory location that has already bee…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:22:51+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89636.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89636.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89636"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532294"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89636"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89636"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89636.mbox"},{"url":"https://git.kernel.org/stable/c/14f60e959b5ac813715ff72e127beb3584ddabf6"},{"url":"https://git.kernel.org/stable/c/3ff9462bb7a06d8d32a1dc02d39580b078ec9e55"},{"url":"https://git.kernel.org/stable/c/7507bd1885643d0461a6017767492450af1ce2a3"},{"url":"https://git.kernel.org/stable/c/9ab46a13798a61d9d020b01d4e57efdabe6624fa"},{"url":"https://git.kernel.org/stable/c/5baab40404a9393bcc0b7b8f1950bf2c307e0984"},{"url":"https://git.kernel.org/stable/c/b1b741cf8e7ce1b91d937e23decd3d3358748700"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00653,"epssPercentile":0.49515,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89636","body":"## Overview\n\nA flaw was found in the Linux kernel's Server Message Block (SMB) client. When the `free_tgts()` function frees data structures, a pointer (`ce->tgthint`) is not properly reset, leaving it pointing to a memory location that has already been deallocated. If this pointer is subsequently used, it can lead to a use-after-free vulnerability. This could potentially allow a local attacker to cause a denial of service or escalate privileges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89636.json)\n\n**kernel: smb: client: clear ce->tgthint in free_tgts()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208113,"id":"CVE-2026-89636","ts":1789922714748,"field":"cvss","old":"9.8","new":"7"},{"seq":208112,"id":"CVE-2026-89636","ts":1789922714748,"field":"severity","old":"critical","new":"high"},{"seq":197826,"id":"CVE-2026-89636","ts":1789384320564,"field":"cvss","old":"7.1","new":"9.8"},{"seq":197825,"id":"CVE-2026-89636","ts":1789384320564,"field":"severity","old":"high","new":"critical"},{"seq":183723,"id":"CVE-2026-89636","ts":1789356677108,"field":"cvss","old":"9.8","new":"7.1"},{"seq":183722,"id":"CVE-2026-89636","ts":1789356677108,"field":"severity","old":"critical","new":"high"},{"seq":153476,"id":"CVE-2026-89636","ts":1789285350670,"field":"cvss","old":null,"new":"9.8"},{"seq":153475,"id":"CVE-2026-89636","ts":1789285350670,"field":"severity","old":"none","new":"critical"},{"seq":147430,"id":"CVE-2026-89636","ts":1789270210878,"field":"cvss","old":null,"new":"7.1"},{"seq":147429,"id":"CVE-2026-89636","ts":1789270210878,"field":"severity","old":"none","new":"high"},{"seq":109186,"id":"CVE-2026-89636","ts":1789183730647,"field":"cvss","old":null,"new":"7.1"},{"seq":109185,"id":"CVE-2026-89636","ts":1789183730647,"field":"severity","old":"none","new":"high"}]}