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CVE-2024-26957

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: fix reference counting on zcrypt card objects Tests with hot-plugging crytpo cards on KVM guests with debug kernel…

Published May 1, 2024CWE-416EPSS 0.24%

Overview

CVE-2024-26957 is a high-severity vulnerability. It was published on May 1, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

s390/zcrypt: fix reference counting on zcrypt card objects

Tests with hot-plugging crytpo cards on KVM guests with debug

kernel build revealed an use after free for the load field of

the struct zcrypt_card. The reason was an incorrect reference

handling of the zcrypt card object which could lead to a free

of the zcrypt card object while it was still in use.

This is an example of the slab message:

kernel: 0x00000000885a7512-0x00000000885a7513 @offset=1298. First byte 0x68 instead of 0x6b

kernel: Allocated in zcrypt_card_alloc+0x36/0x70 [zcrypt] age=18046 cpu=3 pid=43

kernel: kmalloc_trace+0x3f2/0x470

kernel: zcrypt_card_alloc+0x36/0x70 [zcrypt]

kernel: zcrypt_cex4_card_probe+0x26/0x380 [zcrypt_cex4]

kernel: ap_device_probe+0x15c/0x290

kernel: really_probe+0xd2/0x468

kernel: driver_probe_device+0x40/0xf0

kernel: __device_attach_driver+0xc0/0x140

kernel: bus_for_each_drv

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484Refgit.kernel.org/stable/c/50ed48c80fecbe17218afed4f8bed005c802976cRefgit.kernel.org/stable/c/6470078ab3d8f222115e11c4ec67351f3031b3ddRefgit.kernel.org/stable/c/7e500849fa558879a1cde43f80c7c048c2437058Refgit.kernel.org/stable/c/9daddee03de3f231012014dab8ab2b277a116a55Refgit.kernel.org/stable/c/a55677878b93e9ebc31f66d0e2fb93be5e7836a6Refgit.kernel.org/stable/c/a64ab862e84e3e698cd351a87cdb504c7fc575caRefgit.kernel.org/stable/c/b7f6c3630eb3f103115ab0d7613588064f665d0dRefgit.kernel.org/stable/c/befb7f889594d23e1b475720cf93efd2f77df000Refgit.kernel.org/stable/c/394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26957?

CVE-2024-26957 is a high-severity vulnerability. It was published on May 1, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-26957?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-26957?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-26957?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26957 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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