CVE-2026-52917 sctp: diag: reject stale associations in dump_one path
A use-after-free in the Linux kernel SCTP diagnostic path allows attackers to read out-of-bounds memory or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-52917?
CVE-2026-52917 is a high-severity use after free vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
sctp: diag: reject stale associations in dump_one path
The SCTP exact sock_diag lookup can hold a transport reference, block on lock_sock(sk), and then resume after sctp_association_free() has marked the association dead and freed its bind address list.
When that happens, inet_assoc_attr_size() and inet_diag_msg_sctpasoc_fill() can still dereference association state that is no longer valid for reporting. In particular, inet_diag_msg_sctpasoc_fill() may read an empty bind-address list as a real sctp_sockaddr_entry and trigger an out-of-bounds read from unrelated association memory.
Reject the association after taking the socket lock if it has been reaped or detached from the endpoint, and report the lookup as stale. This keeps the exact dump-one path from formatting torn association state.
Which versions are affected by CVE-2026-52917?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-52917?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-52917 being exploited?
There is no known exploitation of CVE-2026-52917 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90893, BELL-CVE-2026-52917, DEBIAN-CVE-2026-52917, GHSA-fcw9-vwjp-9j4v, ROOT-OS-DEBIAN-11-CVE-2026-52917, ROOT-OS-DEBIAN-12-CVE-2026-52917 and 3 more.