Vulnerability details
CVE-2026-98261
cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
Official description
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server use-after-free in cifs_chan_skip_or_disable() When a secondary channel is no longer supported by the server, cifs_chan_skip_or_disable() drops the channel reference with cifs_put_tcp_session() and then continues to use the server pointer by calling cifs_signal_cifsd_for_reconnect() on it and reading its primary_server pointer. cifs_put_tcp_session() can drop the last reference of the channel and tear it down, so both the channel and the primary server (whose reference is also dropped by cifs_put_tcp_session()) can be freed before they are signaled for reconnect. Signal the channel and the primary server and capture the primary server pointer before dropping the channel reference with cifs_put_tcp_session().
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 6.8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 50e8363ecc85da49764781da90ebffe1a657b370 ≤ v < 0338489960ddad6368bce55e8adbc176c523093d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.6.15 ≤ v < 6.6.158 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.7.3 ≤ v < 6.8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < 7a1b27780b113583a94256d58dabfe7c0d9286e7 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < 717e0a25036b6c92cecace30913b2d874a4c22b8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < fcc0a935bb6e37ecbf7e4335061309f896f35780 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < edd52eae5fcfb8433b6bb0e7cd98db438fe01227 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d
- https://git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227
- https://git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780
- https://git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7
- https://git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8
Details
- Published
- 2026-10-06
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
Weaknesses (CWE)
- —