CVE-2026-93039
HighCVSS 7.4Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, the ASoC meson driver's meson_card_reallocate_links() grows the DAI link and private data arrays with two consecutive krealloc() calls, updating owner pointers only after both succeed. If the first krealloc() moves the data and the second fails, card->dai_link points to an already freed block, leading to a use-after-free and double free.
Risk Assessment
A use-after-free and double free can corrupt kernel memory, crash the system, or potentially enable code execution.
Recommendation
Update the Linux kernel to a version with the fix that commits card->dai_link and card->num_links right after the first successful krealloc().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ASoC: meson: Keep link pointers valid on realloc failure meson_card_reallocate_links() grows the DAI link and private data arrays with two consecutive krealloc() calls and updates the owner pointers only after both calls have succeeded. A successful krealloc() may move the data: it frees the old block and returns a new one. When that happens for the link array and the second krealloc() then fails, card->dai_link still points to the block that krealloc() already freed, and the error path frees the new block too. The probe error path then calls meson_card_clean_references(), which dereferences card->dai_link and kfree()s it again, resulting in a use-after-free and a double free. Commit card->dai_link and card->num_links right after the first krealloc() succeeds, so the pointer always refers to a valid allocation that meson_card_clean_references() can walk and free. krealloc() with __GFP_ZERO zero-initializes the added entries, so walking them on the error path is safe. With both failure paths reduced to a plain return, drop the goto labels and the error message.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS