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CVE-2024-50047

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix UAF in async decryption Doing an async decryption (large read) crashes with a slab-use-after-free way down in…

Published Oct 21, 2024CWE-416EPSS 0.52%

Overview

CVE-2024-50047 is a critical-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

smb: client: fix UAF in async decryption

Doing an async decryption (large read) crashes with a

slab-use-after-free way down in the crypto API.

Reproducer:

# mount.cifs -o ...,seal,esize=1 //srv/share /mnt

# dd if=/mnt/largefile of=/dev/null

...

[ 194.196391] ==================================================================

[ 194.196844] BUG: KASAN: slab-use-after-free in gf128mul_4k_lle+0xc1/0x110

[ 194.197269] Read of size 8 at addr ffff888112bd0448 by task kworker/u77:2/899

[ 194.197707]

[ 194.197818] CPU: 12 UID: 0 PID: 899 Comm: kworker/u77:2 Not tainted 6.11.0-lku-00028-gfca3ca14a17a-dirty #43

[ 194.198400] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.2-3-gd478f380-prebuilt.qemu.org 04/01/2014

[ 194.199046] Workqueue: smb3decryptd smb2_decrypt_offload [cifs]

[ 194.200032] Call Trace:

[ 194.200191] <TASK>

[ 194.200327] dump_sta

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/0809fb86ad13b29e1d6d491364fc7ea4fb545995Refgit.kernel.org/stable/c/538c26d9bf70c90edc460d18c81008a4e555925aRefgit.kernel.org/stable/c/8f14a476abba13144df5434871a7225fd29af633Refgit.kernel.org/stable/c/b0abcd65ec545701b8793e12bc27dc98042b151aRefgit.kernel.org/stable/c/bce966530fd5542bbb422cb45ecb775f7a1a6bc3Refgit.kernel.org/stable/c/ef51c0d544b1518b35364480317ab6d3468f205dReflists.debian.org/debian-lts-announce/2025/03/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00030.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-50047?

CVE-2024-50047 is a critical-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2024-50047?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-50047?

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-2024-50047?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-50047 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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