Out-of-bounds write in Linux kernel - CVE-2026-74597

Vulnerability identifier: #VU144959

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74597

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to corrupt memory.

The vulnerability exists due to an out-of-bounds write in ip6ip6_err() and the IPv6 ICMP error reply path when processing a quoted inner IPv6 packet after cloning an outer IPv6 ICMP error skb with stale inet6_skb_parm metadata. A remote attacker can send a specially crafted IPv6 packet to corrupt memory.

Exploitation requires the outer packet to carry a Home Address Option and a malformed inner destination-options header.

Linux kernel
Debian Linux
openEuler
kernel-tools
python3-perf-debuginfo
python3-perf
python2-perf-debuginfo
python2-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-tools - update to 4.19.90-2609.3.0.0391
python3-perf-debuginfo - update to 4.19.90-2609.3.0.0391
python3-perf - update to 4.19.90-2609.3.0.0391
python2-perf-debuginfo - update to 4.19.90-2609.3.0.0391
python2-perf - update to 4.19.90-2609.3.0.0391
perf-debuginfo - update to 4.19.90-2609.3.0.0391
perf - update to 4.19.90-2609.3.0.0391
kernel-tools-devel - update to 4.19.90-2609.3.0.0391
kernel-tools-debuginfo - update to 4.19.90-2609.3.0.0391
kernel-source - update to 4.19.90-2609.3.0.0391
kernel-devel - update to 4.19.90-2609.3.0.0391
kernel-debugsource - update to 4.19.90-2609.3.0.0391
kernel-debuginfo - update to 4.19.90-2609.3.0.0391
bpftool-debuginfo - update to 4.19.90-2609.3.0.0391
bpftool - update to 4.19.90-2609.3.0.0391
kernel - update to 4.19.90-2609.3.0.0391
linux (Debian package) - update to 6.12.105-1

• https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d
• https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183
• https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60
• https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54
• https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08
• https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b
• https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800
• https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e

• Out-of-bounds write in Linux kernel ipv6
• Debian update for linux
• openEuler 20.03 LTS SP4 update for kernel