Out-of-bounds read in Linux kernel - CVE-2026-64550

Vulnerability identifier: #VU139819

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-2026-64550

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in rmnet_map_ingress_handler() and __rmnet_map_ingress_handler() when processing a crafted short MAP frame on the no-aggregation ingress path. A local user can send a specially crafted frame to disclose sensitive information.

The issue occurs when ingress deaggregation is disabled, causing packet parsing to use the on-wire packet length without verifying skb->len first.

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

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-329.0.0.230
bpftool - update to 5.10.0-329.0.0.230
bpftool-debuginfo - update to 5.10.0-329.0.0.230
kernel-debuginfo - update to 5.10.0-329.0.0.230
kernel-debugsource - update to 5.10.0-329.0.0.230
kernel-devel - update to 5.10.0-329.0.0.230
kernel-headers - update to 5.10.0-329.0.0.230
kernel-source - update to 5.10.0-329.0.0.230
kernel-tools - update to 5.10.0-329.0.0.230
kernel-tools-debuginfo - update to 5.10.0-329.0.0.230
kernel-tools-devel - update to 5.10.0-329.0.0.230
perf - update to 5.10.0-329.0.0.230
perf-debuginfo - update to 5.10.0-329.0.0.230
python3-perf - update to 5.10.0-329.0.0.230
python3-perf-debuginfo - update to 5.10.0-329.0.0.230
linux (Debian package) - update to 6.12.100-1

• https://git.kernel.org/stable/c/00f4c366dbca16a40772c3b7ec2d8cba839e9724
• https://git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299
• https://git.kernel.org/stable/c/1b12612c367e4be9b0814c0468e7e687835315b4
• https://git.kernel.org/stable/c/231a8a4b76cb1b1827b3b19d7b3603642f5aaaef
• https://git.kernel.org/stable/c/3868c3244369ab709a90c9aad7534d406009b824
• https://git.kernel.org/stable/c/a54d76d176e50d2fdbd39b7231efe256170339e4
• https://git.kernel.org/stable/c/ed25befc8c36f896b5878f9078faddb67fd7e2d0
• https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3

• Out-of-bounds read in Linux kernel qualcomm rmnet driver
• Debian update for linux
• openEuler 22.03 LTS SP4 update for kernel