Out-of-bounds read in Linux kernel - CVE-2026-74377

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Main Vulnerability Database Vulnerabilities #VU142782

Out-of-bounds read in Linux kernel - CVE-2026-74377

Published: August 15, 2026


Vulnerability identifier: #VU142782
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74377
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause an out-of-bounds read.

The vulnerability exists due to an out-of-bounds read in rxe_resp_check_length() and copy_data() when processing a receive WQE from a shared queue buffer mapped into userspace. A local user can modify WQE fields such as num_sge or sge entries during processing to cause an out-of-bounds read.

The issue affects the non-SRQ queue pair receive path.


Affected software

Linux kernel
openEuler
python3-perf-debuginfo
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-source
kernel-tools
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
kernel-tools-debuginfo
kernel-headers
kernel-extra-modules

How to mitigate CVE-2026-74377

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-source - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
python2-perf - update to 4.19.90-2608.6.0.0388
python2-perf-debuginfo - update to 4.19.90-2608.6.0.0388
python3-perf - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160

External References

Related Security Bulletins