s390/dasd: Fix undersized format-check buffer
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Fix undersized format-check buffer fmt_buffer_size in dasd_eckd_check_device_format() is declared as int, even though one of the multiplicands, sizeof(struct eckd_count), is a size_t. The expression trkcount * rpt_max * sizeof(struct eckd_count) is therefore correctly evaluated at 64-bit width, but the result is silently truncated when it is stored back into the 32-bit fmt_buffer_size variable. For a sufficiently large track range (start_unit/stop_unit are caller-controlled) this truncation yields a buffer size far smaller than the number of tracks actually requested. kzalloc() then succeeds with an undersized allocation, while the subsequent channel program build still operates on the untruncated track count and writes past the end of that buffer. Compute the buffer size with check_mul_overflow() and keep it in a size_t, so that a value that no longer fits results in -EINVAL instead of a silently truncated allocation size.
CVE-2026-80710
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-2026-80710
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": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "aca18289c86f22d3fc2f3f6ff615286e7b1702f6",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "9f88dda2f22927d22498801a92cab6a9424eaf86",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "e16e0fc54120cee3c6f0362de95aab6792865857",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "87f3389cd3920714c53e704778f7ca7f1cf0c39c",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "7f40b346462f563a0d6e841a77b5163d2a882a04",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/block/dasd_eckd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/s390/block/dasd_eckd.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80710
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34364 · Revision 1
- Added to Heist Feed
- Publisher date