CVE-2022-49904net, neigh: Fix null-ptr-deref in neigh_table_clear()
- 5.5MediumCVSS base score
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 13 months later
· 13 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 9bbaed571c4bf1b62ac8703cb359dc090efc3455 – < 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0
- affected 05fdce1ae744dee43c9181fd063c9c0db4f777f2 – < b736592de2aa53aee2d48d6b129bc0c892007bbe
- affected 51be9dd391fd25872b95708a0250f2f7722d2d8e – < b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c
- affected c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8 – < 1c89642e7f2b7ecc9635610653f5c2f0276c0051
- affected db6fa03d80ab076238fc806c9925d1f8b9639d1b – < 2b45d6d0c41cb9593868e476681efb1aae5078a1
- affected 66ba215cb51323e4e55e38fd5f250e0fae0cbc94 – < a99a8ec4c62180c889482a2ff6465033e0743458
- affected 66ba215cb51323e4e55e38fd5f250e0fae0cbc94 – < f8017317cb0b279b8ab98b0f3901a2e0ac880dad
- affected 2dd5ed474115150d8175825bc3b56c6385c3a83b
- affected 4.14.292 – < 4.14.299
- affected 4.19.257 – < 4.19.265
- affected 5.4.212 – < 5.4.224
- affected 5.10.141 – < 5.10.154
- affected 5.15.65 – < 5.15.78
- affected 5.19.7 – < 5.20
- affected 6.0
- unaffected < 6.0
- unaffected 4.14.299 – ≤ 4.14.*
- unaffected 4.19.265 – ≤ 4.19.*
- unaffected 5.4.224 – ≤ 5.4.*
- unaffected 5.10.154 – ≤ 5.10.*
- unaffected 5.15.78 – ≤ 5.15.*
- unaffected 6.0.8 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References
References7
- https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 (opens in a new tab)
- https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe (opens in a new tab)
- https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c (opens in a new tab)
- https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051 (opens in a new tab)
- https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1 (opens in a new tab)
- https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458 (opens in a new tab)
- https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-12848 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2022-49904)Record last updated .