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Medium severity5.5NVD Advisory· Published Jul 29, 2024· Updated May 12, 2026

CVE-2024-42097

CVE-2024-42097

Description

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

ALSA: emux: improve patch ioctl data validation

In load_data(), make the validation of and skipping over the main info block match that in load_guspatch().

In load_guspatch(), add checking that the specified patch length matches the actually supplied data, like load_data() already did.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

In the Linux kernel's ALSA emux driver, missing validation in patch ioctl data could allow a local attacker to trigger memory corruption or read out-of-bounds, leading to a denial of service.

Vulnerability

CVE-2024-42097 is an insufficient input validation vulnerability in the Linux kernel's ALSA emux (Emu10k1) sound driver. The load_data() and load_guspatch() functions, which handle patch loading via the ioctl interface, lacked consistent checks on the size and structure of the user-supplied data. In load_data(), the main info block is not properly validated before being used, and in load_guspatch(), the specified patch length is not checked against the actual amount of data provided [1][2][3][4].

Exploitation

An attacker with local access and the ability to issue the patch-loading ioctl on a sound device (requiring the CAP_SYS_RAWIO capability or membership in the audio group) can craft a malicious patch with mismatched size fields. This inconsistency can cause the kernel to read past the intended buffer or write data to incorrect memory locations [1][2]. No special privileges beyond user-level access to the sound device are needed.

Impact

Successful exploitation leads to out-of-bounds memory access, potentially causing a kernel crash (denial of service) or leaking sensitive kernel memory. Because the vulnerability is in kernel space, an attacker could also theoretically use it to gain further control, though the public description focuses on denial of service [1].

Mitigation

The fix, merged into the Linux kernel stable tree, adds validation in both load_data() and load_guspatch() to ensure the patch header size and total length match the provided data [2][3][4]. Users should update their kernel to a version containing this commit. The vulnerability is also listed in Siemens' advisory SSA-265688 for the SIMATIC S7-1500 TM MFP GNU/Linux subsystem [1].

References
  1. SSA-265688
  2. Making sure you're not a bot!
  3. Making sure you're not a bot!
  4. Making sure you're not a bot!

AI Insight generated on May 20, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

98

Patches

0

No patches discovered yet.

Vulnerability mechanics

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References

10

News mentions

0

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