CVE-2022-49904

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux9bbaed571c4bf1b62ac8703cb359dc090efc3455 < 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0affected
LinuxLinux05fdce1ae744dee43c9181fd063c9c0db4f777f2 < b736592de2aa53aee2d48d6b129bc0c892007bbeaffected
LinuxLinux51be9dd391fd25872b95708a0250f2f7722d2d8e < b49f6b2f21f543d4dc88fb7b1ec2adccb822f27caffected
LinuxLinuxc35adafe42bd6c3bf2aca0a3f523dabc38fc23c8 < 1c89642e7f2b7ecc9635610653f5c2f0276c0051affected
LinuxLinuxdb6fa03d80ab076238fc806c9925d1f8b9639d1b < 2b45d6d0c41cb9593868e476681efb1aae5078a1affected
LinuxLinux66ba215cb51323e4e55e38fd5f250e0fae0cbc94 < a99a8ec4c62180c889482a2ff6465033e0743458affected
LinuxLinux66ba215cb51323e4e55e38fd5f250e0fae0cbc94 < f8017317cb0b279b8ab98b0f3901a2e0ac880dadaffected
LinuxLinux2dd5ed474115150d8175825bc3b56c6385c3a83baffected
LinuxLinux4.14.292 < 4.14.299affected
LinuxLinux4.19.257 < 4.19.265affected
LinuxLinux5.4.212 < 5.4.224affected
LinuxLinux5.10.141 < 5.10.154affected
LinuxLinux5.15.65 < 5.15.78affected
LinuxLinux5.19.7 < 5.20affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux4.14.299 <= 4.14.*unaffected
LinuxLinux4.19.265 <= 4.19.*unaffected
LinuxLinux5.4.224 <= 5.4.*unaffected
LinuxLinux5.10.154 <= 5.10.*unaffected
LinuxLinux5.15.78 <= 5.15.*unaffected
LinuxLinux6.0.8 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References