Use-after-free in Linux kernel - CVE-2026-64007
Published: July 20, 2026
Vulnerability identifier: #VU138637
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-64007
CWE-ID: CWE-416
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 memory corruption or a denial of service.
The vulnerability exists due to a use-after-free in synproxy_tstamp_adjust() in the netfilter synproxy implementation when processing crafted TCP packets that trigger header rewriting on a cloned or non-linear skb. A remote attacker can send a specially crafted packet to cause memory corruption or a denial of service.
The issue affects checksum updates after the packet buffer is made writable, which can result in a write to freed slab memory or a transmitted packet with a stale checksum.
How to mitigate CVE-2026-64007
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/92170e6afe927ab2792a3f71902845789c8e31b1
- https://git.kernel.org/stable/c/9902a1058992de5d95656b64a3bd95c077f7ba2c
- https://git.kernel.org/stable/c/a91887a5b6ee4b98dfbf1db657ed2b879430149e
- https://git.kernel.org/stable/c/af2c22ccb1f621aff487ff47a040e38e058541e7
- https://git.kernel.org/stable/c/c7f945f7da097245a2f8ed7775ce48421047ee96
- https://git.kernel.org/stable/c/d3019c61799adc21811af4b521f11f3dc77f8e04
- https://git.kernel.org/stable/c/dd206819f210522579010d889d45a9530bb494bc
- https://git.kernel.org/stable/c/f0fea2b6d5453a11ad11713bbf37561b9b3a7edf