NULL Pointer Dereference Affecting kernel-modules-extra-matched package, versions *
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELMODULESEXTRAMATCHED-18417805
- published30 Jul 2026
- disclosed25 Jul 2026
Introduced: 25 Jul 2026
NewCVE-2026-64416 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-modules-extra-matched.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-modules-extra-matched package and not the kernel-modules-extra-matched 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:
mm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host
lookup_swap_cgroup_id() passes swap_cgroup_ctrl[type].map to __swap_cgroup_id_lookup() without checking that the type was ever registered via swap_cgroup_swapon(). On a swapless host every ctrl->map is NULL, so __swap_cgroup_id_lookup() dereferences NULL + a scaled swp_offset().
Since commit bea67dcc5eea ("mm: attempt to batch free swap entries for zap_pte_range()"), zap_pte_range() -> swap_pte_batch() calls lookup_swap_cgroup_id() on any non-present, non-none PTE that decodes as a real swap entry, without first validating it against swap_info[]. A single PTE corrupted into a type-0 swap entry takes the host down at process exit.
We hit this in production on a swapless 6.12.58 host: ~1s of "get_swap_device: Bad swap file entry 3f800204222bb" (do_swap_page() being correctly defensive about the same entry) followed by
BUG: unable to handle page fault for address: 000003f800204220 RIP: 0010:lookup_swap_cgroup_id+0x2b/0x60 Call Trace: swap_pte_batch+0xbf/0x230 zap_pte_range+0x4c8/0x780 unmap_page_range+0x190/0x3e0 exit_mmap+0xd9/0x3c0 do_exit+0x20c/0x4b0
syzbot has reported the identical stack.
The source of the PTE corruption is a separate bug; this change makes the teardown path as robust as the fault path already is. Every other caller of lookup_swap_cgroup_id() is downstream of a get_swap_device() that has already validated the entry, so the new branch is cold.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2507064
- https://access.redhat.com/security/cve/CVE-2026-64416
- https://git.kernel.org/stable/c/63b02a9409cb5180398491b093e48bcb5315f5fb
- https://git.kernel.org/stable/c/6a4196d19f477524d2f92adca90fc1fbe9a0420a
- https://git.kernel.org/stable/c/818416fef38759f23210de449663cd9d7e293d39
- https://git.kernel.org/stable/c/b415c00bf23df577a4a95673d00ae76687bcc1d4