CVE-2023-53987
Unknown
Description
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.
SeverityUnknown
CVSS—
Exploit probability—
Product
Linux
PublishedDec 24, 2025
First seenDec 24, 2025
How to fix
Update
- Linux Linux5a08a32e624908890aa0a2eb442bb6a7669891a8, 176cbb6da28f36506cc60a4bec4ab8df0c16713a, ab5fb73ffa01072b4d8031cc05801fa1cb653bee, 5.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | dbca1596bbb08318f5e3b3b99f8ca0a0d3830a65 ≤ v < 5a08a32e624908890aa0a2eb442bb6a7669891a8, dbca1596bbb08318f5e3b3b99f8ca0a0d3830a65 ≤ v < 176cbb6da28f36506cc60a4bec4ab8df0c16713a, dbca1596bbb08318f5e3b3b99f8ca0a0d3830a65 ≤ v < ab5fb73ffa01072b4d8031cc05801fa1cb653bee, de3d723a3985f282a8c9e468d1e198616eb291c8, 5.19.2 ≤ v < 5.20, 6.0 | 5a08a32e624908890aa0a2eb442bb6a7669891a8, 176cbb6da28f36506cc60a4bec4ab8df0c16713a, ab5fb73ffa01072b4d8031cc05801fa1cb653bee, 5.20 |
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