block: don't overwrite bip_vcnt in bio_integrity_copy_user()
In the Linux kernel, the following vulnerability has been resolved: block: don't overwrite bip_vcnt in bio_integrity_copy_user() bio_integrity_add_page() already sets bip_vcnt to 1 for the bounce segment. Overwriting it with nr_vecs breaks bip_vcnt <= bip_max_vcnt on WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h read past the bip_vec[] flex array. On READ the read is in bounds but lands on a saved user bvec instead of the bounce. The line was added for split propagation, but bio_integrity_clone() doesn't copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER.
CVE-2026-64053
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-2026-64053
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": "3991657ae7074c3c497bf095093178bed37ea1b4",
"lessThan": "d18160c9525c63c203656fefd847e94b538cd4a4",
"versionType": "git"
},
{
"status": "affected",
"version": "3991657ae7074c3c497bf095093178bed37ea1b4",
"lessThan": "0d48654af4d1390c888389206cc13b51b82c30e6",
"versionType": "git"
},
{
"status": "affected",
"version": "3991657ae7074c3c497bf095093178bed37ea1b4",
"lessThan": "066be1439593a381b1a29663becfcfe0c92363e7",
"versionType": "git"
},
{
"status": "affected",
"version": "3991657ae7074c3c497bf095093178bed37ea1b4",
"lessThan": "637ad3a56a3b889527d1dacea6fea2a8bd648140",
"versionType": "git"
}
],
"programFiles": [
"block/bio-integrity.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"block/bio-integrity.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64053
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40948 · Revision 1
- Added to Heist Feed
- Publisher date