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CVE-2026-98261

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

No known exploitation. EPSS puts it in the 37th percentile. Fixed versions are out.

CVSS 3.18.1HighEPSS percentile37th0.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix1 product4 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • LinuxAffected: ≥ 50e8363ecc85da49764781da90ebffe1a657b370, < 0338489960ddad6368bce55e8adbc176c523093dUpgrade to: 0338489960ddad6368bce55e8adbc176c523093dAffected: ≥ f591062bdbf4742b7f1622173017f19e927057b0, < edd52eae5fcfb8433b6bb0e7cd98db438fe01227Upgrade to: edd52eae5fcfb8433b6bb0e7cd98db438fe01227Affected: ≥ f591062bdbf4742b7f1622173017f19e927057b0, < fcc0a935bb6e37ecbf7e4335061309f896f35780Upgrade to: fcc0a935bb6e37ecbf7e4335061309f896f35780Affected: ≥ f591062bdbf4742b7f1622173017f19e927057b0, < 7a1b27780b113583a94256d58dabfe7c0d9286e7Upgrade to: 7a1b27780b113583a94256d58dabfe7c0d9286e7 + 4 more branchesStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

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What it is

From the CVE record

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().

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS37th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 37th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

3 events over 1 day, from the signal feeds we watch.

  1. Record updated
  2. Publishedrecord updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Scored 8.1 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Sources

References in the record

And 2 more references. See all after sign-in

In the news

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