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CVE-2025-38480

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 6.1.147, <=6.1.*, <2.6.29, <=6.12.*, 6.6.100, 0, ed9eccbe8970f6eedc1b978c157caf1251a896d4, <2af1e7d389c2619219171d23f5b96dbcbb7f9656, <=6.15.*, 5.4.297, 2.6.29, 6.15.8, <=5.10.*, <=6.6.*, 5.15.190, <c53570e62b5b28bdb56bb563190227f8307817a5, <4c2981bf30401adfcdbfece4ab6f411f7c5875a1, <=5.4.*, 6.16, <3050d197d6bc9ef128944a70210f42d2430b3000, <16256d7efcf7acc9f39abe21522c4c6b77f67c00, 6.12.40, <3ab55ffaaf75d0c7b68e332c1cdcc1b0e0044870, 5.10.241, <=*, <e9cb26291d009243a4478a7ffb37b3a9175bfce9, <=5.15.*, <10f9024a8c824a41827fff1fefefb314c98e2c88

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: Fix use of uninitialized data in insn_rw_emulate_bits() For Comedi `INSN_READ` and `INSN_WRITE` instructions on "digital" subdevices (subdevice types `COMEDI_SUBD_DI`, `COMEDI_SUBD_DO`, and `COMEDI_SUBD_DIO`), it is common for the subdevice driver not to have `insn_read` and `insn_write` handler functions, but to have an `insn_bits` handler function for handling Comedi `INSN_BITS` instructions. In that case, the subdevice's `insn_read` and/or `insn_write` function handler pointers are set to point to the `insn_rw_emulate_bits()` function by `__comedi_device_postconfig()`. For `INSN_WRITE`, `insn_rw_emulate_bits()` currently assumes that the supplied `data[0]` value is a valid copy from user memory. It will at least exist because `do_insnlist_ioctl()` and `do_insn_ioctl()` in "comedi_fops.c" ensure at lease `MIN_SAMPLES` (16) elements are allocated. However, if `insn->n` is 0 (which is allowable for `INSN_READ` and `INSN_WRITE` instructions, then `data[0]` may contain uninitialized data, and certainly contains invalid data, possibly from a different instruction in the array of instructions handled by `do_insnlist_ioctl()`. This will result in an incorrect value being written to the digital output channel (or to the digital input/output channel if configured as an output), and may be reflected in the internal saved state of the channel. Fix it by returning 0 early if `insn->n` is 0, before reaching the code that accesses `data[0]`. Previously, the function always returned 1 on success, but it is supposed to be the number of data samples actually read or written up to `insn->n`, which is 0 in this case.

Gravité et risque d'exploitation

CVE-2025-38480 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 0.18 %, ce qui la place devant 6.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.1.147, <=6.1.*, <2.6.29, <=6.12.*, 6.6.100, 0, ed9eccbe8970f6eedc1b978c157caf1251a896d4, <2af1e7d389c2619219171d23f5b96dbcbb7f9656, <=6.15.*, 5.4.297, 2.6.29, 6.15.8, <=5.10.*, <=6.6.*, 5.15.190, <c53570e62b5b28bdb56bb563190227f8307817a5, <4c2981bf30401adfcdbfece4ab6f411f7c5875a1, <=5.4.*, 6.16, <3050d197d6bc9ef128944a70210f42d2430b3000, <16256d7efcf7acc9f39abe21522c4c6b77f67c00, 6.12.40, <3ab55ffaaf75d0c7b68e332c1cdcc1b0e0044870, 5.10.241, <=*, <e9cb26291d009243a4478a7ffb37b3a9175bfce9, <=5.15.*, <10f9024a8c824a41827fff1fefefb314c98e2c88) 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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