Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: generalize pending status bit Rename NF_FLOW_HW_PENDING to NF_FLOW_PENDING and use it to inhibit the flowtable GC worker until pending hw offload work has been completed. Apparently, nf_flow_offload_stats() can schedule work to retrieve stats while the flow is being removed by GC. And this bit can also be used in a follow up patch to disable GC until the flow has been fully added in both directions. Revert the reordering done in commit d644b23afe1e ("netfilter: flowtable: publish HW_DEAD after worker is done") to prevent a race between GC and hw offload handler.

[ 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/4033e1a9262c57dfbfc594a591a50fcba63c531a
• git.kernel.org/stable/c/4d52b72f3aa68ad0536444e36530bda75070194c
• git.kernel.org/stable/c/7c549fb7eecd01fdba7c0d12c01da876ef8a3214
• git.kernel.org/stable/c/a2cac45848d1cf31ed190db30f90ba8211e9a8ca
• git.kernel.org/stable/c/f7e292f3c8c853f27a1af7eaf3428a0e76fe5fcc