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CVE-2026-53194

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=7.0.*, <=6.12.*, 6.12.94, 0, <14147b7963685957839c76ba8094924e22777d79, <a1288cd700f721c1a119c4f1e8efa234e59caada, 6.1.176, 5.15.210, <=5.10.*, <=6.6.*, <bde742b076cbe26ecc89c8c68c76ae076a524d02, 7.0.13, 6.18.36, <70d86e355c564b5510fde61361df014f5476c83e, <60af1fd82983c26604102e63a3fcc822c186cceb, 7.1, <=6.18.*, <2.6.35, 60b3013cdaf3fa8a17243ca46b19db3cbe08d943, <=*, <0a57320f71941d4e0b1307453c9a1f0939afe666, <=5.15.*, <372f33ebed747d91870f57c0a2e62884a870bffa, <96d47e40bf9db4a9efd5c8fb53287a508d165f14, 6.6.143, 2.6.35, 5.10.259

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: kl5kusb105: fix bulk-out buffer overflow klsi_105_prepare_write_buffer() is called by the generic write path with the bulk-out buffer and its size (bulk_out_size, 64 bytes). It stores a two-byte length header at the start of the buffer and copies the payload from the write fifo starting at buf + KLSI_HDR_LEN, but passes the full buffer size as the number of bytes to copy: count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size, &port->lock); When the fifo holds at least size bytes, size bytes are copied starting two bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its end. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for the header as safe_serial already does. Writing bulk_out_size or more bytes to the tty triggers a slab out-of-bounds write, observed with KASAN by emulating the device with dummy_hcd and raw-gadget: BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0 Write of size 64 at addr ffff888112c62202 by task python3 kfifo_copy_out klsi_105_prepare_write_buffer [kl5kusb105] usb_serial_generic_write_start [usbserial] Allocated by task 139: usb_serial_probe [usbserial] The buggy address is located 2 bytes inside of allocated 64-byte region The out-of-bounds write no longer occurs with this change applied.

Gravité et risque d'exploitation

CVE-2026-53194 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.15 %, ce qui la place devant 3.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 6.12.94, 0, <14147b7963685957839c76ba8094924e22777d79, <a1288cd700f721c1a119c4f1e8efa234e59caada, 6.1.176, 5.15.210, <=5.10.*, <=6.6.*, <bde742b076cbe26ecc89c8c68c76ae076a524d02, 7.0.13, 6.18.36, <70d86e355c564b5510fde61361df014f5476c83e, <60af1fd82983c26604102e63a3fcc822c186cceb, 7.1, <=6.18.*, <2.6.35, 60b3013cdaf3fa8a17243ca46b19db3cbe08d943, <=*, <0a57320f71941d4e0b1307453c9a1f0939afe666, <=5.15.*, <372f33ebed747d91870f57c0a2e62884a870bffa, <96d47e40bf9db4a9efd5c8fb53287a508d165f14, 6.6.143, 2.6.35, 5.10.259) 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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