Out-of-bounds read in Linux kernel - CVE-2026-64450
Published: July 27, 2026
Vulnerability identifier: #VU139498
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-64450
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the TIPC broadcast Gap ACK blocks handling in tipc_bcast_sync_rcv() when processing a crafted broadcast PROTOCOL/STATE_MSG. A remote attacker can send a specially crafted broadcast STATE_MSG with a malformed Gap ACK blocks record to cause a denial of service.
Exploitation requires a TIPC neighbour that has negotiated TIPC_GAP_ACK_BLOCK.
How to mitigate CVE-2026-64450
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/016f5995c37a5a2c45198308f830f244517d70b7
- https://git.kernel.org/stable/c/055663d21dc4336f67933ab26bef3c5934be6324
- https://git.kernel.org/stable/c/2b66974a1b6134a4bbc3bfed181f7418f688eb54
- https://git.kernel.org/stable/c/2de42e268174766cb2e2b90721afdfdff70e0d8d
- https://git.kernel.org/stable/c/74b45af86a767594ba52330cd440ea84e24d700d
- https://git.kernel.org/stable/c/9a51115fcdc78687c8852bf93a1db3951dbb223b
- https://git.kernel.org/stable/c/a21ed5064217cc33726da6c7ef1a520eba43aea1
- https://git.kernel.org/stable/c/f333b6851bdf326fd2134133272dbbed0c94d921