In the Linux kernel, the following vulnerability has been resolved:
xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
After cancel_delayed_work_sync() is called from xfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining states via __xfrm_state_delete(), which calls xfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.
The following is a simple race scenario:
cpu0 cpu1
cleanup_net() [Round 1] ops_undo_list() xfrm_net_exit() xfrm_nat_keepalive_net_fini() cancel_delayed_work_sync(nat_keepalive_work); xfrm_state_fini() xfrm_state_flush() xfrm_state_delete(x) __xfrm_state_delete(x) xfrm_nat_keepalive_state_updated(x) schedule_delayed_work(nat_keepalive_work); rcu_barrier(); net_complete_free(); net_passive_dec(net); llist_add(&net->defer_free_list, &defer_free_list);
cleanup_net() [Round 2] rcu_barrier(); net_complete_free() kmem_cache_free(net_cachep, net); nat_keepalive_work() // on freed net
To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf6.12-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.18-debuginfoUpgrade kernel6.18-tools-develUpgrade python3-perf6.12-debuginfoUpgrade bpftool6.18-debuginfoUpgrade bpftool6.12Upgrade kernel6.12-debuginfoUpgrade kernel6.18-modules-extraUpgrade python3-perf6.18-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-libbpf-develUpgrade kernel6.12-libbpf-staticUpgrade kernel6.18-headersUpgrade kernel6.12-tools-develUpgrade kernel6.18-tools-debuginfoUpgrade perf6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.12-libbpfUpgrade kernel6.18-develUpgrade python3-perf6.18Upgrade kernel6.12-headersUpgrade bpftool6.12-debuginfoUpgrade kernel6.12Upgrade kernel6.12-libbpf-debuginfoUpgrade kernel-livepatch-6.12.80-105.147Upgrade kernel6.12-develUpgrade kernel6.18Upgrade kernel6.12-modules-extraUpgrade python3-perf6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel-livepatch-6.18.25-52.107Upgrade bpftool6.18Upgrade perf6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.12-modules-extra-commonUpgrade perf6.12Upgrade kernel6.18-modules-extra-common | May 6, 2026 | Apr 6, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 10, 2026 | Apr 6, 2026 |
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