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CVE-2026-68184

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <f3e2715a150066f09aa82c30fa983fb184ad6dd5, 2.6.12, 6.12.101, <35b68e24c5a69fa4545f46f05f6c849223034cb6, 0, <0329b661349f42f9616f2733da67edffbbb8455d, <=7.1.*, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 5.15.216, <7344c84e32413e5c8832f74b8a612b0194e5c051, <=5.10.*, <d43c5c0c935522deae7339e0c2399365f3bf0016, <=6.6.*, <e150c9a10baee55d3bfbc96dbe66b205e8b4fd44, 6.18.42, 7.1.6, 6.1.183, <45c65df5339deea3cf204902aac383fe995941a7, <=6.18.*, <b27e195d4db8dea263050bdbeb11881b2999c9c6, <=*, <=5.15.*, 5.10.265, 6.6.148, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: cdrom: fix stack out-of-bounds read in CDROMVOLCTRL mmc_ioctl_cdrom_volume() first reads the audio control mode page into a 32-byte stack buffer with cgc->buflen set to 24. If the device reports a block descriptor, the function increases cgc->buflen to include that descriptor and reads the page again. For CDROMVOLCTRL, the function then builds a MODE SELECT parameter list by moving cgc->buffer forward by offset - 8 bytes. This drops the block descriptor from the outgoing payload and leaves a new 8-byte mode parameter header in front of the audio control page. However, cgc->buflen is left unchanged. With a standard 8-byte block descriptor, cgc->buffer points at buffer + 8 but cgc->buflen remains 32. cdrom_mode_select() therefore asks the low level packet path to write 32 bytes from that adjusted pointer, reading 8 bytes past the end of the 32-byte stack buffer. This is not hit by CDROMVOLREAD, and CDROMVOLCTRL only triggers it on drives that return a non-zero block descriptor length, which helps explain why it has gone unnoticed. The overread is also sent to the device as extra MODE SELECT payload, so it may not produce an obvious local failure. Reduce cgc->buflen by the same amount as the buffer pointer adjustment so the MODE SELECT transfer covers only the intended parameter list.

Gravité et risque d'exploitation

CVE-2026-68184 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 0.22 %, ce qui la place devant 11.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <f3e2715a150066f09aa82c30fa983fb184ad6dd5, 2.6.12, 6.12.101, <35b68e24c5a69fa4545f46f05f6c849223034cb6, 0, <0329b661349f42f9616f2733da67edffbbb8455d, <=7.1.*, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 5.15.216, <7344c84e32413e5c8832f74b8a612b0194e5c051, <=5.10.*, <d43c5c0c935522deae7339e0c2399365f3bf0016, <=6.6.*, <e150c9a10baee55d3bfbc96dbe66b205e8b4fd44, 6.18.42, 7.1.6, 6.1.183, <45c65df5339deea3cf204902aac383fe995941a7, <=6.18.*, <b27e195d4db8dea263050bdbeb11881b2999c9c6, <=*, <=5.15.*, 5.10.265, 6.6.148, 7.2) 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

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