CVE-2023-53987
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 versions
Linux kernel versions
5.19.2,
6.0
and later are affected. Fixed in
6.1.24,
6.2.11,
6.3
and their respective stable series.
References
The following references provide additional information about CVE-2023-53987 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/176cbb6da28f36506cc60a4bec4ab8df0c16713a
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PatchKernel patch commithttps://git.kernel.org/stable/c/5a08a32e624908890aa0a2eb442bb6a7669891a8
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PatchKernel patch commithttps://git.kernel.org/stable/c/ab5fb73ffa01072b4d8031cc05801fa1cb653bee
Frequently asked questions
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What is CVE-2023-53987?
CVE-2023-53987 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.19.2 onward and has been patched in 6.1.24, 6.2.11 and 6.3. CVE-2023-53987 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2023-53987?
Yes — CVE-2023-53987 has been patched. Fixed versions include 6.1.24, 6.2.11 and 6.3. If you are running Linux kernel 5.19.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2023-53987 actively exploited?
No — CVE-2023-53987 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.