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Fencer Vulns
high 7.8

CVE-2026-64053 json

block: don't overwrite bip_vcnt in bio_integrity_copy_user()

published 2026-07-19 3 mo ago modified 2026-10-19 20 d ago also EUVD-2026-45626

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.12.92, 6.18.34, 7.0.11, 7.1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-64053

  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1008.8
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1003.4
  • linux-ibm Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-azure Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-raspi Ubuntu 26.04 LTS 7.0.0-1015.15
  • linux-riscv Ubuntu 26.04 LTS 7.0.0-28.28.1

ubuntu advisories UBUNTU-CVE-2026-64053

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.2 6.12.0-211.59.1.el10_2
  • rv RHEL 10.2 6.12.0-211.59.1.el10_2
  • perf RHEL 10.2 6.12.0-211.59.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.59.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.59.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.59.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.59.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.59.1.el10_2

red hat advisories RHSA-2026:71233RHSA-2026:71232

  • kernel-livepatch-SLE16-RT_Update_5 Linux Micro 6.2 14-160000.1.1
  • kernel-livepatch-SLE16-RT_Update_3 Linux Micro 6.2 15-160000.1.1
  • kernel-livepatch-SLE16-RT_Update_2 Linux Micro 6.2 16-160000.1.1
  • kernel-livepatch-SLE16-RT_Update_1 Linux Micro 6.2 18-160000.1.1
  • kernel-livepatch-SLE16-RT_Update_0 Linux Micro 6.2 19-160000.3.4
  • kernel-livepatch-SLE16-RT_Update_12 Linux Micro 6.2 8-160000.1.1
  • kernel-livepatch-SLE16-RT_Update_11 Linux Micro 6.2 10-160000.1.1
  • kernel-livepatch-SLE16-RT_Update_10 Linux Micro 6.2 10-160000.1.1

suse advisories SUSE-SU-2026:24534-1SUSE-SU-2026:24535-1SUSE-SU-2026:24536-1SUSE-SU-2026:24537-1SUSE-SU-2026:24538-1SUSE-SU-2026:24526-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • kernel AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-64k-core AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-debug-core AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-64k-modules AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-debug-modules AlmaLinux 9 5.14.0-687.51.1.el9_8
  • kernel-64k-debug-core AlmaLinux 9 5.14.0-687.51.1.el9_8

almalinux advisories ALSA-2026:71232ALSA-2026:71233

  • kernel Rocky Linux 9 5.14.0-687.51.1.el9_8

rocky linux advisories RLSA-2026:71232

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64053 updated cvss 5.5

kernel: block: don't overwrite bip_vcnt in bio_integrity_copy_user()

  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.51.1.el9_8, perf 5.14.0-687.51.1.el9_8, rtla 5.14.0-687.51.1.el9_8, python3-perf 5.14.0-687.51.1.el9_8, kernel-devel-matched 5.14.0-687.51.1.el9_8, kernel-64k-devel-matched 5.14.0-687.51.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:71232
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.59.1.el10_2, perf 6.12.0-211.59.1.el10_2, rtla 6.12.0-211.59.1.el10_2, python3-perf 6.12.0-211.59.1.el10_2, kernel-devel-matched 6.12.0-211.59.1.el10_2, kernel-64k-devel-matched 6.12.0-211.59.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:71233
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.51.1.el9_8, kernel-64k 5.14.0-687.51.1.el9_8, kernel-core 5.14.0-687.51.1.el9_8, kernel-tools 5.14.0-687.51.1.el9_8, kernel-modules 5.14.0-687.51.1.el9_8, kernel-64k-core 5.14.0-687.51.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:71232
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.59.1.el10_2, kernel-64k 6.12.0-211.59.1.el10_2, kernel-core 6.12.0-211.59.1.el10_2, kernel-tools 6.12.0-211.59.1.el10_2, kernel-modules 6.12.0-211.59.1.el10_2, kernel-64k-core 6.12.0-211.59.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:71233
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.51.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.51.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.51.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.51.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.51.1.el9_8
    fixed: vendor fix RHSA-2026:71232
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.59.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.59.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.59.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.59.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.59.1.el10_2
    fixed: vendor fix RHSA-2026:71233
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.51.1.el9_8, kernel-rt-64k 5.14.0-687.51.1.el9_8, kernel-rt-core 5.14.0-687.51.1.el9_8, kernel-rt-modules 5.14.0-687.51.1.el9_8, kernel-rt-64k-core 5.14.0-687.51.1.el9_8, kernel-rt-debug-core 5.14.0-687.51.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:71232
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.59.1.el10_2, kernel-rt-64k 6.12.0-211.59.1.el10_2, kernel-rt-core 6.12.0-211.59.1.el10_2, kernel-rt-modules 6.12.0-211.59.1.el10_2, kernel-rt-64k-core 6.12.0-211.59.1.el10_2, kernel-rt-debug-core 6.12.0-211.59.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:71233
show 3 more
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.51.1.el9_8, kernel-rt-core 5.14.0-687.51.1.el9_8, kernel-rt-modules 5.14.0-687.51.1.el9_8, kernel-rt-debug-core 5.14.0-687.51.1.el9_8, kernel-rt-modules-core 5.14.0-687.51.1.el9_8, kernel-rt-debug-modules 5.14.0-687.51.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:71232
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.59.1.el10_2, kernel-rt-core 6.12.0-211.59.1.el10_2, kernel-rt-modules 6.12.0-211.59.1.el10_2, kernel-rt-debug-core 6.12.0-211.59.1.el10_2, kernel-rt-modules-core 6.12.0-211.59.1.el10_2, kernel-rt-debug-modules 6.12.0-211.59.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:71233
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
23 d ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.