CVE-2026-74715 Affecting kernel-64kb-devel package, versions <6.12.0-160000.40.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES1600-KERNEL64KBDEVEL-21882499
- published30 Oct 2026
- disclosed24 Oct 2026
Introduced: 24 Oct 2026
NewCVE-2026-74715 (opens in a new tab)How to fix?
Upgrade SLES:16.0.0 kernel-64kb-devel to version 6.12.0-160000.40.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-64kb-devel package and not the kernel-64kb-devel package as distributed by SLES.
See How to fix? for SLES:16.0.0 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix netns reference imbalance in conntrack kfuncs
The opts argument of the BPF conntrack kfuncs can point to a shared map value. __bpf_nf_ct_lookup() and __bpf_nf_ct_alloc_entry() read opts->netns_id separately when acquiring and releasing the network namespace reference.
The reference imbalance can occur as follows:
CPU 0 CPU 1 read opts->netns_id (-1) skip get_net_ns_by_id() write opts->netns_id (id) read opts->netns_id (id) put_net(net) /* no matching get */
The reverse transition leaks the reference. Repeating the unmatched put can destroy a live namespace and crash later users.
The kernel reported:
Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef] RIP: 0010:bpf_prog_test_run_xdp+0x52c/0x1700 Call Trace: __sys_bpf+0x1662/0x50c0 __x64_sys_bpf+0x73/0xb0 do_syscall_64+0xf9/0x540 entry_SYSCALL_64_after_hwframe+0x77/0x7f Kernel panic - not syncing: Fatal exception
Snapshot every input field of opts with READ_ONCE() before validating or using it. The netns_id snapshot keeps the namespace get/put pair balanced, while the other snapshots keep the remaining options from changing partway through an invocation. The individual reads can still observe an inconsistent combination during a concurrent update, but each selected field value remains stable for that invocation.
References
- https://www.suse.com/security/cve/CVE-2026-74715.html
- https://bugzilla.suse.com/1277890
- https://git.kernel.org/stable/c/e5e060eb63d10b41ab60fd955649479d99b38210
- https://git.kernel.org/stable/c/fdeba03fea78407a8c52faa99177c9f7f29f90eb
- https://git.kernel.org/stable/c/4af94462c0ca2187a02a1a6641020ae888c74d5c
- https://git.kernel.org/stable/c/41731d4290400cb898f15f049ae4018d45415e69
- https://git.kernel.org/stable/c/fb22bedf0c4f4f05bfa6e4a7ec0fd97bbdff9ce8
- https://git.kernel.org/stable/c/cfde990193135a35637e55f69e83e4ab441e60ab