s390/vfio_ccw: Limit the number of channel program segments
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program. The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.
CVE-2026-80554
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-2026-80554
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": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "15fb4559a7fdf0b8725e433a71cfd03a1313a48b",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "a1625f66eaa1200068a0e2c05bc90e65182fc4e3",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "4ee94790490ae8dcc97df8597f07836c8a81bbcf",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "5405c90d6a47b3014e74ee0618a162449abbbc93",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/cio/vfio_ccw_cp.c",
"drivers/s390/cio/vfio_ccw_cp.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/s390/cio/vfio_ccw_cp.c",
"drivers/s390/cio/vfio_ccw_cp.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80554
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #34323 · Revision 1
- Added to Heist Feed
- Publisher date