{"id":"CVE-2026-98261","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix server use-after-free in cifs_chan_skip_or_disable()\n\nWhen a secondary channel is no longer supported by the server,\ncifs_chan_skip_or_disable() drops the cha…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix server use-after-free in cifs_chan_skip_or_disable()\n\nWhen a secondary channel is no longer supported by the server,\ncifs_chan_skip_or_disable() drops the cha…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 50e8363ecc85da49764781da90ebffe1a657b370 < 0338489960ddad6368bce55e8adbc176c523093d","Linux >= f591062bdbf4742b7f1622173017f19e927057b0 < edd52eae5fcfb8433b6bb0e7cd98db438fe01227","Linux >= f591062bdbf4742b7f1622173017f19e927057b0 < fcc0a935bb6e37ecbf7e4335061309f896f35780","Linux >= f591062bdbf4742b7f1622173017f19e927057b0 < 7a1b27780b113583a94256d58dabfe7c0d9286e7","Linux >= f591062bdbf4742b7f1622173017f19e927057b0 < 717e0a25036b6c92cecace30913b2d874a4c22b8","Linux d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4","Linux >= 6.6.15 < 6.6.158","Linux >= 6.7.3 < 6.8","Linux 6.8"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T07:17:07.403","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98261","references":[{"url":"https://git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98261.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98261"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546405"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98261"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98261"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98261.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00405,"epssPercentile":0.34617,"ingestedAt":"2026-10-06T08:50:17.427Z","cwe":["CWE-825"],"scores":{"nvd":8.1,"vendor":7,"cna":8.1},"slug":"CVE-2026-98261","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix server use-after-free in cifs_chan_skip_or_disable()\n\nWhen a secondary channel is no longer supported by the server,\ncifs_chan_skip_or_disable() drops the channel reference with\ncifs_put_tcp_session() and then continues to use the server pointer by\ncalling cifs_signal_cifsd_for_reconnect() on it and reading its\nprimary_server pointer. cifs_put_tcp_session() can drop the last\nreference of the channel and tear it down, so both the channel and the\nprimary server (whose reference is also dropped by\ncifs_put_tcp_session()) can be freed before they are signaled for\nreconnect.\n\nSignal the channel and the primary server and capture the primary\nserver pointer before dropping the channel reference with\ncifs_put_tcp_session().\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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98261.json)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":217304,"id":"CVE-2026-98261","ts":1791361310405,"field":"cvss","old":null,"new":"8.1"},{"seq":217303,"id":"CVE-2026-98261","ts":1791361310405,"field":"severity","old":"none","new":"high"}]}