CVE-2022-49904
net, neigh: Fix null-ptr-deref in neigh_table_clear()
Reported by linux · Published May 1, 2025
In the Linux kernel, the following vulnerability has been resolved: net, neigh: Fix null-ptr-deref in neigh_table_clear() When IPv6 module gets initialized but hits an error in the middle, kenel panic with: KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception When ipv6 initialization fails, it will try to cleanup and calls: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref. Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| kernel-devel | Amazon Linux | 4.14.299-223.520.amzn2 |
| kernel-livepatch-4.14.299-223.520 | Amazon Linux | 1.0-0.amzn2 |
| python-perf | Amazon Linux | 4.14.299-223.520.amzn2 |
| kernel-headers | Amazon Linux | 4.14.299-223.520.amzn2 |
| linux_kernel | linux | 6.0.8, 5.15.78, 5.10.154, 5.4.224, 4.19.265, 4.14.299 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 9bbaed571c4bf1b62ac8703cb359dc090efc3455, 05fdce1ae744dee43c9181fd063c9c0db4f777f2, 51be9dd391fd25872b95708a0250f2f7722d2d8e |
| Linux | Linux | 6.0, 0, 4.14.299 |
| amazon:2 | kernel-devel | 0 |
| amazon:2 | kernel-livepatch-4.14.299-223.520 | 0 |
| amazon:2 | python-perf | 0 |
| amazon:2 | kernel-headers | 0 |
| linux | linux_kernel | 4.14.292, 4.19.257, 5.4.212 |
| Linux | Linux | 5.19.7, 4.19.257, 5.4.212 |
| amazon:2 | kernel-tools-devel | 0 |
| amazon:2 | kernel | 0 |
| amazon:2 | kernel-tools | 0 |
| amazon:2 | perf | 0 |
Timeline
- May 1, 2025 CVE Published
- May 2, 2025 EPSS Score (30 in total, the first dated here)
- May 23, 2026 Coalition ESS Score
- Jun 2, 2026 Security Advisory (169 in total, the first dated here)
- Sep 21, 2026 CVE Updated
- Sep 23, 2026 Distribution Patch (131 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2022-49904
vulnetix vdb fixes CVE-2022-49904Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2022-49904/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart