Heimdall Security Logo

CVE-2026-45878

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.12.*, e0f85f4690d089cc1a60337decafb1acf7eec45e, <5a19302cab5cec7ae7f1a60c619951e6c17d8742, <6.5, 0, <a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488, 7.0, 6.12.75, <971bf8e61e9b4abaacf9b35eaf76ec222758f9d6, 6.5, <=6.6.*, <=6.19.*, <2b36c0c1bcbbe15f6cfa9652084b3124c835a150, <=6.18.*, <3c38a0f07aa2bfef2b219b1f045534ad93f85afd, 6.6.128, 6.19.4, <=*, 6.18.14

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 The address watch clear code receives watch_id as an unsigned value (u32), but some helper functions were using a signed int and checked bits by shifting with watch_id. If a very large watch_id is passed from userspace, it can be converted to a negative value. This can cause invalid shifts and may access memory outside the watch_points array. drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 Fix this by checking that watch_id is within MAX_WATCH_ADDRESSES before using it. Also use BIT(watch_id) to test and clear bits safely. This keeps the behavior unchanged for valid watch IDs and avoids undefined behavior for invalid ones. Fixes the below: drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448 kfd_dbg_trap_clear_dev_address_watch() error: buffer overflow 'pdd->watch_points' 4 <= u32max user_rl='0-3,2147483648-u32max' uncapped drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c 433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd, 434 uint32_t watch_id) 435 { 436 int r; 437 438 if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id)) kfd_dbg_owns_dev_watch_id() doesn't check for negative values so if watch_id is larger than INT_MAX it leads to a buffer overflow. (Negative shifts are undefined). 439 return -EINVAL; 440 441 if (!pdd->dev->kfd->shared_resources.enable_mes) { 442 r = debug_lock_and_unmap(pdd->dev->dqm); 443 if (r) 444 return r; 445 } 446 447 amdgpu_gfx_off_ctrl(pdd->dev->adev, false); --> 448 pdd->watch_points[watch_id] = pdd->dev->kfd2kgd->clear_address_watch( 449 pdd->dev->adev, 450 watch_id); v2: (as per, Jonathan Kim) - Add early watch_id >= MAX_WATCH_ADDRESSES validation in the set path to match the clear path. - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id().

Gravité et risque d'exploitation

CVE-2026-45878 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 0.18 %, ce qui la place devant 7.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.12.*, e0f85f4690d089cc1a60337decafb1acf7eec45e, <5a19302cab5cec7ae7f1a60c619951e6c17d8742, <6.5, 0, <a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488, 7.0, 6.12.75, <971bf8e61e9b4abaacf9b35eaf76ec222758f9d6, 6.5, <=6.6.*, <=6.19.*, <2b36c0c1bcbbe15f6cfa9652084b3124c835a150, <=6.18.*, <3c38a0f07aa2bfef2b219b1f045534ad93f85afd, 6.6.128, 6.19.4, <=*, 6.18.14) 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