cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
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().
CVE-2026-98261
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98261
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "50e8363ecc85da49764781da90ebffe1a657b370",
"lessThan": "0338489960ddad6368bce55e8adbc176c523093d",
"versionType": "git"
},
{
"status": "affected",
"version": "f591062bdbf4742b7f1622173017f19e927057b0",
"lessThan": "edd52eae5fcfb8433b6bb0e7cd98db438fe01227",
"versionType": "git"
},
{
"status": "affected",
"version": "f591062bdbf4742b7f1622173017f19e927057b0",
"lessThan": "fcc0a935bb6e37ecbf7e4335061309f896f35780",
"versionType": "git"
},
{
"status": "affected",
"version": "f591062bdbf4742b7f1622173017f19e927057b0",
"lessThan": "7a1b27780b113583a94256d58dabfe7c0d9286e7",
"versionType": "git"
},
{
"status": "affected",
"version": "f591062bdbf4742b7f1622173017f19e927057b0",
"lessThan": "717e0a25036b6c92cecace30913b2d874a4c22b8",
"versionType": "git"
},
{
"status": "affected",
"version": "d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.15",
"lessThan": "6.6.158",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.7.3",
"lessThan": "6.8",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/smb2pdu.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/smb2pdu.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98261
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38340 · Revision 1
- Added to Heist Feed
- Publisher date