Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: sctp: avoid livelock while updating retransmit path sctp_assoc_update_retran_path() can loop forever when every remaining transport, including retran_path, is SCTP_UNCONFIRMED: the state check runs before the wraparound test, so the loop cannot observe that it has completed a full pass. Fix this by considering a transport only when it is not UNCONFIRMED, then checking whether the walk has returned to retran_path. This makes the full-pass termination independent of the transport state while preserving the existing fallback selection semantics. Also restore the NULL guard around the retran_path assignment. In the all-UNCONFIRMED case there is no eligible replacement transport, and installing NULL would leave later retransmit-path users and the debug print with a NULL path.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4019

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98866CVE-2026-98624CVE-2026-98745+326 more CVEs

[ References ]References

• git.kernel.org/stable/c/173610fff55022a5ad1579fbcc7faa97467b58b7
• git.kernel.org/stable/c/3fe624c3843694ab096fdb198526ba0c659febbe
• git.kernel.org/stable/c/43410c1f2db53516e95ddd7e5b4b02f495b78121
• git.kernel.org/stable/c/83b1a7f9e718828ef364a7b004254ebb2d0035fe
• git.kernel.org/stable/c/c9338057df1025f578fe7d0ff08bada87b8b838d
• git.kernel.org/stable/c/d2c31b837406395e576afeb25958c98e9938f3f6
• git.kernel.org/stable/c/d893a7cc1cb41dd510f338bb2bfd8f29b14eaf49
• git.kernel.org/stable/c/ddc34cc0834c873871e88b055ee6a260676efe97