Expired Pointer Dereference Affecting kernel-64k-modules-extra package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-KERNEL64KMODULESEXTRA-20283140
- published30 Sept 2026
- disclosed25 Sept 2026
Introduced: 25 Sep 2026
NewCVE-2026-97609 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-64k-modules-extra.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules-extra package and not the kernel-64k-modules-extra package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
netfilter: cttimeout: prevent UAF during module unload
nf_ct_set_timeout() protects the timeout hook dereference and policy lookup with rcu_read_lock(). cttimeout_exit(), however, unregisters the per-net operations before it clears the hook.
This allows the following interleaving:
CPU 0 CPU 1 cttimeout_exit() nf_ct_set_timeout() unregister_pernet_subsys() rcu_read_lock() kfree(pernet) h = nf_ct_timeout_hook h->timeout_find_get() nfct_timeout_pernet()
The hook still points to ctnl_timeout_find_get() when CPU 1 looks up the already freed per-net timeout list. KASAN reported:
BUG: KASAN: slab-use-after-free in ctnl_timeout_find_get Read of size 8 by task poc/90 Call Trace: ctnl_timeout_find_get+0x271/0x2a0 [nfnetlink_cttimeout] nf_ct_set_timeout+0x7b/0x3c0 xt_ct_tg_check+0x724/0xb20 xt_check_target+0x234/0xa90 do_ipt_set_ctl+0x570/0x1270 Allocated by task 89: __kmalloc_noprof+0x16e/0x460 ops_init+0x6d/0x420 register_pernet_operations+0x2f6/0x670 Freed by task 91: kfree+0x131/0x390 ops_undo_list+0x3d4/0x730 unregister_pernet_operations+0x232/0x490 unregister_pernet_subsys+0x1c/0x30 cttimeout_exit+0x52/0x970 [nfnetlink_cttimeout]
Clear the hook and wait for existing readers before unregistering the per-net operations. This blocks new policy lookups and ensures readers that observed the hook finish before the per-net storage is freed.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2541014
- https://access.redhat.com/security/cve/CVE-2026-97609
- https://git.kernel.org/stable/c/1f69c570a73f2dedf75ea5166d47622d5fa958c1
- https://git.kernel.org/stable/c/a7fdd86c386b7f7cc72a126389c2cdb55d035221
- https://git.kernel.org/stable/c/fec9b1de0d02de8dafa3cc344bcb91cf28660643