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CVE-2026-74651

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.1 · Élevée
EPSS 0.3%
Linux•Linux•Versions : <=6.1.*, <01ab275f8f3e497a13ebbe4ded44ec0623bccde3, <=6.12.*, 6.6.152, <e167a38a8a8f50f137721fef1a1fbba0f4588b5d, <0d19f0600fbb610c42f2a86f95c35706dc04691b, 0, <=7.1.*, 5.15.216, <1c3e23e78862493e8cf1adad02b10ffcb8b9921c, <=5.10.*, <=6.6.*, <4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9, 7.1.9, 4.12, 6.1.183, <=6.18.*, 6.12.104, <b45be82387bf759931acdd21ca7dfe740f16eb97, 6.18.45, <42c5a0d454aa5b54fec17162d9a1f8c30f8af45a, <=*, <=5.15.*, <4.12, 5.10.265, 7.2, <c9068f82a0906b29c905e8788edb62c3208c7c8a, 554c0a3abf216c991c5ebddcdb2c08689ecd290b

Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie() rtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific information element without checking that the element is long enough, causing an out-of-bounds read for a short trailing IE. The function locates a vendor-specific IE (EID 221) with rtw_get_ie() and then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte version word at pbuf + 6. Those accesses require the IE body to be at least 6 bytes, but rtw_get_ie() only guarantees that the element fits within the buffer; it does not enforce a minimum body length. A vendor-specific IE whose length byte is 0 to 5, placed at the end of the buffer, therefore makes these reads run past the end of the IE and past the end of the buffer itself. The buffer holds information elements taken from received management frames and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which is kmemdup'd to its exact length, so the read can run off the end of the allocation. The sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and rtw_get_wps_ie() in this file already reject too-short vendor-specific IEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in line with them, and needs a minimum of 6 rather than 4 bytes because of the version word. Add the missing length check.

Gravité et risque d'exploitation

CVE-2026-74651 obtient un score CVSS de 8.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.27 %, ce qui la place devant 18.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <01ab275f8f3e497a13ebbe4ded44ec0623bccde3, <=6.12.*, 6.6.152, <e167a38a8a8f50f137721fef1a1fbba0f4588b5d, <0d19f0600fbb610c42f2a86f95c35706dc04691b, 0, <=7.1.*, 5.15.216, <1c3e23e78862493e8cf1adad02b10ffcb8b9921c, <=5.10.*, <=6.6.*, <4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9, 7.1.9, 4.12, 6.1.183, <=6.18.*, 6.12.104, <b45be82387bf759931acdd21ca7dfe740f16eb97, 6.18.45, <42c5a0d454aa5b54fec17162d9a1f8c30f8af45a, <=*, <=5.15.*, <4.12, 5.10.265, 7.2, <c9068f82a0906b29c905e8788edb62c3208c7c8a, 554c0a3abf216c991c5ebddcdb2c08689ecd290b) 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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