CVE-2026-31778None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In 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.
Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 02d9c5b0b5553a391448b6d655262bd829f90234Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 66194c2575a4f567577ae70b1d7561163ce791a6Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < a82c1bce2d1299dd3c686a8fe48cf75b79a403c7Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 3178b62e2e31bab39f63d4c8e54bf4ee0a425627Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 3afa2e67f3523a980a2f90fd63c22322ac2b9ce0Linux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 7594a6464873d90fd229e5b94cdd3b92c9feabedLinux >= bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a < 45424e871abf2a152e247a9cff78359f18dd95c0Linux 2.6.31Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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