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

Vulnerability details

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.

Affected software

How to mitigate CVE-2026-64550

External References

• 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

Related Security Bulletins

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