High 8.1Published Oct 6, 2026

CVE-2026-98261cifs: Fix server use-after-free in cifs_chan_skip_or_disable()

Updated under an hour ago (Oct 26, 2026, 1:50 PM ET)

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EPSS puts the chance of exploitation in the next 30 days at 0.44%, higher than 37% of scored CVEs.

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Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.44% (percentile 37)
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 50e8363ecc85da49764781da90ebffe1a657b370 before 0338489960ddad6368bce55e8adbc176c523093d; from f591062bdbf4742b7f1622173017f19e927057b0 before edd52eae5fcfb8433b6bb0e7cd98db438fe01227; from f591062bdbf4742b7f1622173017f19e927057b0 before fcc0a935bb6e37ecbf7e4335061309f896f35780; from f591062bdbf4742b7f1622173017f19e927057b0 before 7a1b27780b113583a94256d58dabfe7c0d9286e7; from f591062bdbf4742b7f1622173017f19e927057b0 before 717e0a25036b6c92cecace30913b2d874a4c22b8; d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4; from 6.6.15 before 6.6.158; from 6.7.3 before 6.8	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.