CVE-2026-98261cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
- 8.1HighCVSS base score
- 0.40%Exploitation in 30 daysEPSS · top 65% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 13 days later
· 13 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.40% · top 65% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- affected 50e8363ecc85da49764781da90ebffe1a657b370 – < 0338489960ddad6368bce55e8adbc176c523093d
- affected f591062bdbf4742b7f1622173017f19e927057b0 – < edd52eae5fcfb8433b6bb0e7cd98db438fe01227
- affected f591062bdbf4742b7f1622173017f19e927057b0 – < fcc0a935bb6e37ecbf7e4335061309f896f35780
- affected f591062bdbf4742b7f1622173017f19e927057b0 – < 7a1b27780b113583a94256d58dabfe7c0d9286e7
- affected f591062bdbf4742b7f1622173017f19e927057b0 – < 717e0a25036b6c92cecace30913b2d874a4c22b8
- affected d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4
- affected 6.6.15 – < 6.6.158
- affected 6.7.3 – < 6.8
- affected 6.8
- unaffected < 6.8
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.54 – ≤ 6.18.*
- unaffected 7.2.8 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d (opens in a new tab)
- https://git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227 (opens in a new tab)
- https://git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780 (opens in a new tab)
- https://git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7 (opens in a new tab)
- https://git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-93189 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98261)Record last updated .