ALSA: caiaq: fix stack out-of-bounds read in init_card

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Summary

CVECVE-2026-31778
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:41 UTC
Updated2026-05-11 18:05:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: fix stack out-of-bounds read in init_card The loop creates a whitespace-stripped copy of the card shortname where `len < sizeof(card->id)` is used for the bounds check. Since sizeof(card->id) is 16 and the local id buffer is also 16 bytes, writing 16 non-space characters fills the entire buffer, overwriting the terminating nullbyte. When this non-null-terminated string is later passed to snd_card_set_id() -> copy_valid_id_string(), the function scans forward with `while (*nid && ...)` and reads past the end of the stack buffer, reading the contents of the stack. A USB device with a product name containing many non-ASCII, non-space characters (e.g. multibyte UTF-8) will reliably trigger this as follows: BUG: KASAN: stack-out-of-bounds in copy_valid_id_string sound/core/init.c:696 [inline] BUG: KASAN: stack-out-of-bounds in snd_card_set_id_no_lock+0x698/0x74c sound/core/init.c:718 The off-by-one has been present since commit bafeee5b1f8d ("ALSA: snd_usb_caiaq: give better shortname") from June 2009 (v2.6.31-rc1), which first introduced this whitespace-stripping loop. The original code never accounted for the null terminator when bounding the copy. Fix this by changing the loop bound to `sizeof(card->id) - 1`, ensuring at least one byte remains as the null terminator.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-125

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 02d9c5b0b5553a391448b6d655262bd829f90234 git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6 git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 66194c2575a4f567577ae70b1d7561163ce791a6 git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a a82c1bce2d1299dd3c686a8fe48cf75b79a403c7 git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 3178b62e2e31bab39f63d4c8e54bf4ee0a425627 git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 3afa2e67f3523a980a2f90fd63c22322ac2b9ce0 git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 7594a6464873d90fd229e5b94cdd3b92c9feabed git Not specified
CNA Linux Linux affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 45424e871abf2a152e247a9cff78359f18dd95c0 git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/66194c2575a4f567577ae70b1d7561163ce791a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/45424e871abf2a152e247a9cff78359f18dd95c0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a82c1bce2d1299dd3c686a8fe48cf75b79a403c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3afa2e67f3523a980a2f90fd63c22322ac2b9ce0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/02d9c5b0b5553a391448b6d655262bd829f90234 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3178b62e2e31bab39f63d4c8e54bf4ee0a425627 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7594a6464873d90fd229e5b94cdd3b92c9feabed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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