{"cve":"CVE-2022-49904","nvd":{"published":"2025-05-01T15:16:15.480","modified":"2026-06-17T05:19:28.487","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet, neigh: Fix null-ptr-deref in neigh_table_clear()\n\nWhen IPv6 module gets initialized but hits an error in the middle,\nkenel panic with:\n\nKASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f]\nCPU: 1 PID: 361 Comm: insmod\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nRIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370\nRSP: 0018:ffff888012677908 EFLAGS: 00000202\n...\nCall Trace:\n <TASK>\n neigh_table_clear+0x94/0x2d0\n ndisc_cleanup+0x27/0x40 [ipv6]\n inet6_init+0x21c/0x2cb [ipv6]\n do_one_initcall+0xd3/0x4d0\n do_init_module+0x1ae/0x670\n...\nKernel panic - not syncing: Fatal exception\n\nWhen ipv6 initialization fails, it will try to cleanup and calls:\n\nneigh_table_clear()\n  neigh_ifdown(tbl, NULL)\n    pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL))\n    # dev_net(NULL) triggers null-ptr-deref.\n\nFix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev\nis NULL, to make kernel not panic immediately.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0","https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051","https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1","https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458","https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:22.920403922+00:00"},"epss":{"cve":"CVE-2022-49904","score":0.00202,"percentile":0.10223,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}