Heimdall Security Logo

CVE-2026-31778

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6, <7594a6464873d90fd229e5b94cdd3b92c9feabed, <66194c2575a4f567577ae70b1d7561163ce791a6, 0, 6.6.134, 7.0, <=5.10.*, <=6.6.*, <=6.19.*, <2.6.31, <02d9c5b0b5553a391448b6d655262bd829f90234, 5.15.203, <3afa2e67f3523a980a2f90fd63c22322ac2b9ce0, <3178b62e2e31bab39f63d4c8e54bf4ee0a425627, <=6.18.*, <a82c1bce2d1299dd3c686a8fe48cf75b79a403c7, 6.12.81, 2.6.31, <=*, 5.10.253, <=5.15.*, bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a, <45424e871abf2a152e247a9cff78359f18dd95c0, 6.1.168, 6.18.22, 6.19.12

Description

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.

Gravité et risque d'exploitation

CVE-2026-31778 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6, <7594a6464873d90fd229e5b94cdd3b92c9feabed, <66194c2575a4f567577ae70b1d7561163ce791a6, 0, 6.6.134, 7.0, <=5.10.*, <=6.6.*, <=6.19.*, <2.6.31, <02d9c5b0b5553a391448b6d655262bd829f90234, 5.15.203, <3afa2e67f3523a980a2f90fd63c22322ac2b9ce0, <3178b62e2e31bab39f63d4c8e54bf4ee0a425627, <=6.18.*, <a82c1bce2d1299dd3c686a8fe48cf75b79a403c7, 6.12.81, 2.6.31, <=*, 5.10.253, <=5.15.*, bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a, <45424e871abf2a152e247a9cff78359f18dd95c0, 6.1.168, 6.18.22, 6.19.12) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE