Riskcovery

CVE-2026-64053

block: don't overwrite bip_vcnt in bio_integrity_copy_user()

State
Published
Severity
7.8 High
Published
Jul 19, 2026
Updated
Oct 19, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 3991657ae7074c3c497bf095093178bed37ea1b4 to before d18160c9525c63c203656fefd847e94b538cd4a4Affected
  • 3991657ae7074c3c497bf095093178bed37ea1b4 to before 0d48654af4d1390c888389206cc13b51b82c30e6Affected
  • 3991657ae7074c3c497bf095093178bed37ea1b4 to before 066be1439593a381b1a29663becfcfe0c92363e7Affected
  • 3991657ae7074c3c497bf095093178bed37ea1b4 to before 637ad3a56a3b889527d1dacea6fea2a8bd648140Affected
LinuxLinux
  • 6.11Affected
  • before 6.11Not affected
  • 6.12.92 through 6.12.*Not affected
  • 6.18.34 through 6.18.*Not affected
  • 7.0.11 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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