s390/vfio_ccw: Fix out of bounds check on CCW array
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Fix out of bounds check on CCW array The routine ccwchain_calc_length() counts the number of channel command words (CCWs) that are chained together in a single channel program, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs. The loop itself is "do..while (count < 257)", and while the logic in is_cpa_within_range() correctly adjusts between the 0-index array of CCWs and the count of CCWs starting at 1, this means it would look at a possible 257th CCW before ending the loop and (correctly) returning an error. Fix this by restructuring the loop to break as soon as 256 CCWs (thus indexes 0-255) are examined, without looking at memory outside the range.
CVE-2026-80550
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-2026-80550
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": "0282fb1c4b638eecfe2cc558092c460911d8f7e2",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "907adc667d902fafbdb2d740d57b55bd025dc4cd",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "af3f80ca4c8b17f20f9e588def076288fdb49e65",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "499a8a66b1598bfab97182aed15e0f1646074a3d",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "4c2e1d359d7a2b82cdf3254e4e480af9417f99fb",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "d5d096cd9369e986d4e5153baa86b8b35c283e09",
"versionType": "git"
},
{
"status": "affected",
"version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
"lessThan": "a005b7f1a491ffda61bff0fd0f6548f8986fb977",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/cio/vfio_ccw_cp.c"
],
"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": "5.10.266",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"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"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80550
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34319 · Revision 1
- Added to Heist Feed
- Publisher date