Improper control of a resource through its lifetime in Linux kernel - CVE-2026-43039
Published: May 2, 2026
Vulnerability identifier: #VU128867
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43039
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to cause memory corruption.
The vulnerability exists due to improper resource management in emac_dispatch_skb_zc() when recycling an skb backed by the NAPI page frag allocator. A local attacker can trigger packet processing to cause memory corruption.
The issue occurs because a non-page_pool skb is marked for recycle, causing the free path to return pages to a page_pool that does not own them.
Affected software
Linux kernel
How to mitigate CVE-2026-43039
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3