Out-of-bounds read in Linux kernel - CVE-2026-52999

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Main Vulnerability Database Vulnerabilities #VU135378

Out-of-bounds read in Linux kernel - CVE-2026-52999

Published: June 25, 2026


Vulnerability identifier: #VU135378
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-52999
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause incorrect logging behavior.

The vulnerability exists due to an out-of-bounds read in nf_osf_match_one() in nfnetlink_osf when processing TCP option matching across multiple fingerprints. A remote attacker can send specially crafted network traffic to cause incorrect logging behavior.

The issue is triggered when NF_OSF_LOGLEVEL_ALL is configured and matching continues after an earlier fingerprint match.


Affected software

Linux kernel
Ubuntu
openEuler
kernel-devel
kernel
bpftool
kernel-tools-debuginfo
kernel-tools
bpftool-debuginfo
kernel-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf-debuginfo
kernel-source
kernel-debugsource
python3-perf-debuginfo
python3-perf
python2-perf
linux (Ubuntu package)
linux-kvm (Ubuntu package)
linux-oracle-5.4 (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-5.4 (Ubuntu package)
kernel-headers
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-raspi (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-52999

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-devel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
kernel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
bpftool - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
kernel-tools-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
kernel-tools - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
bpftool-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
kernel-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
kernel-tools-devel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
perf - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
perf-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
python2-perf-debuginfo - update to 4.19.90-2608.6.0.0388
kernel-source - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
kernel-debugsource - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
python3-perf-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
python3-perf - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-326.0.0.227
python2-perf - update to 4.19.90-2608.6.0.0388
linux (Ubuntu package) - addressed in versions 5.4.0.234.226, 5.4.0-234.254, 5.4.0-234.254~18.04.1, 5.4.0-1066.69, 5.4.0.1080.80, 5.4.0-1080.84, 5.4.0-1108.113, 5.4.0-1108.113~18.04.1, 5.4.0.1108.137, 5.4.0.1121.117, 5.4.0-1121.128, 5.4.0.1136.133, 5.4.0-1136.146, 5.4.0-1145.158, 5.4.0-1145.158~18.04.1, 5.4.0.1145.176, 5.4.0.1160.154, 5.4.0-1160.170+fips1, 5.4.0.1162.160, 5.4.0-1162.173, 5.4.0-1162.173~18.04.1, 5.4.0.1165.167, 5.4.0-1165.174, 5.4.0-1165.174~18.04.1, 5.4.0.1167.159, 5.4.0-1167.173, 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-kvm (Ubuntu package) - addressed in versions 5.4.0.1149.145, 5.4.0-1149.158
linux-oracle-5.4 (Ubuntu package) - update to 5.4.0-1161.171~18.04.1
linux-aws-fips (Ubuntu package) - addressed in versions 5.4.0.1163.110, 5.4.0-1163.174+fips1
linux-gcp-fips (Ubuntu package) - addressed in versions 5.4.0.1165.107, 5.4.0-1165.174+fips1, 6.8.0-1064.72+fips1
linux-azure-5.4 (Ubuntu package) - addressed in versions 5.4.0.1167.103, 5.4.0-1167.173+fips1, 5.4.0-1167.173~18.04.1
kernel-headers - update to 5.10.0-326.0.0.227
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.8.0-1061.64+1, 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1106.104, 5.15.0-1106.109, 6.8.0-1061.65, 6.8.0-2050.52
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1, 6.8.0-1063.71+fips2
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1, 7.0.0-1008.8, 7.0.0-1010.10
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1, 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1032.32
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins