CVE-2023-53987

Summary

In the Linux kernel, the following vulnerability has been resolved:

ping: Fix potentail NULL deref for /proc/net/icmp.

After commit dbca1596bbb0 ("ping: convert to RCU lookups, get rid of rwlock"), we use RCU for ping sockets, but we should use spinlock for /proc/net/icmp to avoid a potential NULL deref mentioned in the previous patch.

Let's go back to using spinlock there.

Note we can convert ping sockets to use hlist instead of hlist_nulls because we do not use SLAB_TYPESAFE_BY_RCU for ping sockets.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdbca1596bbb08318f5e3b3b99f8ca0a0d3830a65 < 5a08a32e624908890aa0a2eb442bb6a7669891a8affected
LinuxLinuxdbca1596bbb08318f5e3b3b99f8ca0a0d3830a65 < 176cbb6da28f36506cc60a4bec4ab8df0c16713aaffected
LinuxLinuxdbca1596bbb08318f5e3b3b99f8ca0a0d3830a65 < ab5fb73ffa01072b4d8031cc05801fa1cb653beeaffected
LinuxLinuxde3d723a3985f282a8c9e468d1e198616eb291c8affected
LinuxLinux5.19.2 < 5.20affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.24 <= 6.1.*unaffected
LinuxLinux6.2.11 <= 6.2.*unaffected
LinuxLinux6.3 <= *unaffected

Weaknesses

References