CVE-2026-23231
High · 7.8CVSS
7.8
EPSS
0.8%
Published
Mar 4, 2026
CISA due date
—
The record
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between. This creates two use-after-free conditions: 1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be walking the chain when the error path frees it. 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly installs the IPv4 hook before IPv6 registration fails. Packets entering nft_do_chain() via the transient IPv4 hook can still be dereferencing chain->blob_gen_X when the error path frees the chain. Add synchronize_rcu() between nft_chain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | dtb-aarch64 | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-64kb | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-azure | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-default | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-default-base | 0 | 6.12.0-160000.27.1.160000.2.8 |
| openSUSE:Leap 16.0 | kernel-docs | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-rt | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-source | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-syms | 0 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | 0 | 6.12.0-160000.28.1 |
| openSUSE:Tumbleweed | kernel-source | 0 | 6.19.8-1.1 |
Related vulnerabilities
- CVE-2026-46317 In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Reassign… Also affects dtb-aarch64
- CVE-2026-46316 In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its… Also affects dtb-aarch64
- CVE-2026-46181 In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix… Also affects dtb-aarch64
- CVE-2026-46176 In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix error… Also affects dtb-aarch64
- CVE-2026-46159 In the Linux kernel, the following vulnerability has been resolved: btrfs: fix… Also affects dtb-aarch64
- CVE-2026-46114 In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Reject… Also affects dtb-aarch64
- CVE-2026-46090 In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix peer… Also affects dtb-aarch64
- CVE-2026-46094 In the Linux kernel, the following vulnerability has been resolved: ext4: fix bounds… Also affects dtb-aarch64