{"id":"CVE-2026-89636","title":"smb: client: clear ce->tgthint in free_tgts()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: clear ce->tgthint in free_tgts()\n\nWhen free_tgts() frees all structures in ce->tlist, ce->tgthint\nis left pointing to one of the freed cache_dfs_tgt struct…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 14f60e959b5ac813715ff72e127beb3584ddabf6","Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 3ff9462bb7a06d8d32a1dc02d39580b078ec9e55","Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 7507bd1885643d0461a6017767492450af1ce2a3","Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 9ab46a13798a61d9d020b01d4e57efdabe6624fa","Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 5baab40404a9393bcc0b7b8f1950bf2c307e0984","Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < b1b741cf8e7ce1b91d937e23decd3d3358748700","Linux 5.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:24:47.621556Z"},"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:50:08.281Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89636","references":[{"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"},{"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"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00663,"epssPercentile":0.51477,"scores":{"cna":9.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89636","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: clear ce->tgthint in free_tgts()\n\nWhen free_tgts() frees all structures in ce->tlist, ce->tgthint\nis left pointing to one of the freed cache_dfs_tgt structures.\n\nIf ce->tgthint is not reset before it is used later, it results\nin a use-after-free.\n\nSet ce->tgthint to NULL in free_tgts() after the elements are\nfreed to reflect that no elements remain.\n\n## Affected\n\n- `Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 14f60e959b5ac813715ff72e127beb3584ddabf6`\n- `Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 3ff9462bb7a06d8d32a1dc02d39580b078ec9e55`\n- `Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 7507bd1885643d0461a6017767492450af1ce2a3`\n- `Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 9ab46a13798a61d9d020b01d4e57efdabe6624fa`\n- `Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < 5baab40404a9393bcc0b7b8f1950bf2c307e0984`\n- `Linux >= 54be1f6c1c37498bba557049df646cc239fa37e3 < b1b741cf8e7ce1b91d937e23decd3d3358748700`\n- `Linux 5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":223270,"id":"CVE-2026-89636","ts":1792180037204,"field":"cvss","old":"7","new":"9.8"},{"seq":223269,"id":"CVE-2026-89636","ts":1792180037204,"field":"severity","old":"high","new":"critical"},{"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"}]}