{"id":"DEBIAN-CVE-2022-49904","details":"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:  \u003cTASK\u003e  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-\u003eproxy_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.","modified":"2026-09-01T16:05:33.764959933Z","published":"2025-05-01T15:16:15.480Z","upstream":["CVE-2022-49904"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49904"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49904.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49904.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49904.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}