CVE-2025-21916

Description

In the Linux kernel, the following vulnerability has been resolved: usb: atm: cxacru: fix a flaw in existing endpoint checks Syzbot once again identified a flaw in usb endpoint checking, see [1]. This time the issue stems from a commit authored by me (2eabb655a968 ("usb: atm: cxacru: fix endpoint checking in cxacru_bind()")). While using usb_find_common_endpoints() may usually be enough to discard devices with wrong endpoints, in this case one needs more than just finding and identifying the sufficient number of endpoints of correct types - one needs to check the endpoint's address as well. Since cxacru_bind() fills URBs with CXACRU_EP_CMD address in mind, switch the endpoint verification approach to usb_check_XXX_endpoints() instead to fix incomplete ep testing. [1] Syzbot report: usb 5-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 0 PID: 1378 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... RIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649 cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline] cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223 usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058 cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377 usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396 really_probe+0x2b9/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 ...

Gravité et risque d'exploitation

CVE-2025-21916 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 0.22 %, ce qui la place devant 11.8 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 6.6.37, 6.6.83, 5.4.279, ac9007520e392541a29daebaae8b9109007bc781, <=6.12.*, 6.1.131, 6.10, 75ddbf776dd04a09fb9e5267ead5d0c989f84506, 0, <6.10, <bf4409f84023b52b5e9b36c0a071a121eee42138, <cfc295f7cccf66cbd5123416bcf1bee2e1bd37de, 6.12.19, 1aac4be1aaa5177506219f01dce5e29194e5e95a, <6.1.131, <5.10.235, 6.14, <197e78076c5ecd895f109158c4ea2954b9919af6, <4.20, 6.13.7, 6.9.8, <=5.10.*, <=6.6.*, <903b80c21458bb1e34c3a78c5fdc553821e357f8, <319529e0356bd904528c64647725a2272d297c83, f536f09eb45e4de8d1b9accee9d992aa1846f1d4, <6.6.83, 5.15.162, <=5.4.*, 5584c776a1af7807ca815ee6265f2c1429fc5727, <a0475a885d69849b1ade38add6d64338dfa83a8f, 5.4.291, 2eabb655a968b862bc0c31629a09f0fbf3c80d51, 5.10.221, <5.15.179, 5.15.179, 6.1.97, 5159a81924311c1ec786ad9fdef784ead8676a6a, <=*, <=5.15.*, 4.19.317, 5.10.235, 23926d316d2836315cb113569f91393266eb5b47, <=6.13.*, <5.4.291, <dcd592ab9dd8a2bfc36e75583b9006db2a77ec24, <c90aad369899a607cfbc002bebeafd51e31900cd) 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

• https://git.kernel.org/stable/c/dcd592ab9dd8a2bfc36e75583b9006db2a77ec24
• https://git.kernel.org/stable/c/319529e0356bd904528c64647725a2272d297c83
• https://git.kernel.org/stable/c/bf4409f84023b52b5e9b36c0a071a121eee42138
• https://git.kernel.org/stable/c/197e78076c5ecd895f109158c4ea2954b9919af6
• https://git.kernel.org/stable/c/a0475a885d69849b1ade38add6d64338dfa83a8f
• https://git.kernel.org/stable/c/cfc295f7cccf66cbd5123416bcf1bee2e1bd37de
• https://git.kernel.org/stable/c/903b80c21458bb1e34c3a78c5fdc553821e357f8
• https://git.kernel.org/stable/c/c90aad369899a607cfbc002bebeafd51e31900cd