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CVE-2024-50043

Linux Kernel use-after-free

9.8 CRITICALEPSS 0.42%
  1. Published21 Oct 2024

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix possible badness in FREE_STATEID When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors. In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Kernel≥ 6.9 < 6.11.4 · 6.12

Remediation

Fixed in
Linux Kernel≥ 6.11.4

References

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Frequently asked

Is CVE-2024-50043 being actively exploited?

CVE-2024-50043 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.42%.

How severe is CVE-2024-50043?

CVE-2024-50043 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2024-50043?

Affected products include Linux Kernel.

How do I fix CVE-2024-50043?

Upgrade affected software to a fixed version, for example Linux Kernel 6.11.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.