CVE-2026-53355
UnknownSummary
In the Linux kernel, a vulnerability in the RDS (Reliable Datagram Sockets) subsystem for InfiniBand (IB) was found where the i_sends pointer is not cleared during setup unwind. After a failed rds_ib_setup_qp() call, the i_sends memory is freed but the pointer remains stale, potentially leading to a use-after-free condition on subsequent connection teardown attempts.
Risk Assessment
The risk involves a use-after-free vulnerability that could cause unpredictable system behavior, including potential privilege escalation or kernel panic. An attacker might exploit this to destabilize the system or gain unauthorized access.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit addressing the vulnerability). Monitor official security advisories from your Linux distribution and apply the appropriate patch.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: rds: clear i_sends on setup unwind The RDS IB connection teardown path is written so it can run during partial startup and on repeated shutdown attempts. It uses NULL pointers to distinguish resources that are still owned from resources that have already been released. When rds_ib_setup_qp() fails after allocating i_sends but before allocating i_recvs, the sends_out path frees i_sends without clearing the pointer. A later shutdown pass can still treat that stale pointer as a live send ring allocation. Clear i_sends after vfree() in the error unwind path so the existing shutdown logic continues to use the correct ownership state.