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THREATINT
PUBLISHED

CVE-2024-47678

icmp: change the order of rate limits



AssignerLinux
Reserved2024-09-30
Published2024-10-21
Updated2024-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: icmp: change the order of rate limits ICMP messages are ratelimited : After the blamed commits, the two rate limiters are applied in this order: 1) host wide ratelimit (icmp_global_allow()) 2) Per destination ratelimit (inetpeer based) In order to avoid side-channels attacks, we need to apply the per destination check first. This patch makes the following change : 1) icmp_global_allow() checks if the host wide limit is reached. But credits are not yet consumed. This is deferred to 3) 2) The per destination limit is checked/updated. This might add a new node in inetpeer tree. 3) icmp_global_consume() consumes tokens if prior operations succeeded. This means that host wide ratelimit is still effective in keeping inetpeer tree small even under DDOS. As a bonus, I removed icmp_global.lock as the fast path can use a lock-free operation.

Product status

Default status
unaffected

4cdf507d5452 before 997ba8889611
affected

4cdf507d5452 before 662ec52260cc
affected

4cdf507d5452 before a7722921adb0
affected

4cdf507d5452 before 483397b4ba28
affected

4cdf507d5452 before 8c2bd38b95f7
affected

Default status
affected

3.18
affected

Any version before 3.18
unaffected

6.1.113
unaffected

6.6.54
unaffected

6.10.13
unaffected

6.11.2
unaffected

6.12-rc1
unaffected

References

https://git.kernel.org/stable/c/997ba8889611891f91e8ad83583466aeab6239a3

https://git.kernel.org/stable/c/662ec52260cc07b9ae53ecd3925183c29d34288b

https://git.kernel.org/stable/c/a7722921adb046e3836eb84372241f32584bdb07

https://git.kernel.org/stable/c/483397b4ba280813e4a9c161a0a85172ddb43d19

https://git.kernel.org/stable/c/8c2bd38b95f75f3d2a08c93e35303e26d480d24e

cve.org CVE-2024-47678

nvd.nist.gov CVE-2024-47678

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