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CVE-2025-37949

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 6.14.7, <=6.12.*, <=6.14.*, 6.6.91, <1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27, 4.11, 0, <cbfaf46b88a4c01b64c4186cdccd766c19ae644c, <8b02f85e84dc6f7c150cef40ddb69af5a25659e5, <=5.10.*, 5.4.294, <=6.6.*, fd8aa9095a95c02dcc35540a263267c29b8fda9d, 5.15.183, <=5.4.*, <4.11, 6.12.29, 6.15, <4d260a5558df4650eb87bc41b2c9ac2d6b2ba447, <=*, <8e9c8a0393b5f85f1820c565ab8105660f4e8f92, <=5.15.*, <2466b0f66795c3c426cacc8998499f38031dbb59, <0e94a246bb6d9538010b6c02d2b1d4717a97b2e5, 6.1.139, <f1bcac367bc95631afbb918348f30dec887d0e1b, 5.10.238

Description

In the Linux kernel, the following vulnerability has been resolved: xenbus: Use kref to track req lifetime Marek reported seeing a NULL pointer fault in the xenbus_thread callstack: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: e030:__wake_up_common+0x4c/0x180 Call Trace: <TASK> __wake_up_common_lock+0x82/0xd0 process_msg+0x18e/0x2f0 xenbus_thread+0x165/0x1c0 process_msg+0x18e is req->cb(req). req->cb is set to xs_wake_up(), a thin wrapper around wake_up(), or xenbus_dev_queue_reply(). It seems like it was xs_wake_up() in this case. It seems like req may have woken up the xs_wait_for_reply(), which kfree()ed the req. When xenbus_thread resumes, it faults on the zero-ed data. Linux Device Drivers 2nd edition states: "Normally, a wake_up call can cause an immediate reschedule to happen, meaning that other processes might run before wake_up returns." ... which would match the behaviour observed. Change to keeping two krefs on each request. One for the caller, and one for xenbus_thread. Each will kref_put() when finished, and the last will free it. This use of kref matches the description in Documentation/core-api/kref.rst

Gravité et risque d'exploitation

CVE-2025-37949 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 0.24 %, ce qui la place devant 14.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 6.14.7, <=6.12.*, <=6.14.*, 6.6.91, <1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27, 4.11, 0, <cbfaf46b88a4c01b64c4186cdccd766c19ae644c, <8b02f85e84dc6f7c150cef40ddb69af5a25659e5, <=5.10.*, 5.4.294, <=6.6.*, fd8aa9095a95c02dcc35540a263267c29b8fda9d, 5.15.183, <=5.4.*, <4.11, 6.12.29, 6.15, <4d260a5558df4650eb87bc41b2c9ac2d6b2ba447, <=*, <8e9c8a0393b5f85f1820c565ab8105660f4e8f92, <=5.15.*, <2466b0f66795c3c426cacc8998499f38031dbb59, <0e94a246bb6d9538010b6c02d2b1d4717a97b2e5, 6.1.139, <f1bcac367bc95631afbb918348f30dec887d0e1b, 5.10.238) 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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