CVE-2025-21916

MEDIUM EPSS 8.3%
Published Apr 1, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 1, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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 ...

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
8.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 17

VendorProductVersionRange
linuxlinux_kernel*≥4.19.317  –  <4.20
linuxlinux_kernel*≥5.4.279  –  <5.4.291
linuxlinux_kernel*≥5.10.221  –  <5.10.235
linuxlinux_kernel*≥5.15.162  –  <5.15.179
linuxlinux_kernel*≥6.1.97  –  <6.1.131
linuxlinux_kernel*≥6.6.37  –  <6.6.83
linuxlinux_kernel*≥6.9.8  –  <6.10
linuxlinux_kernel*≥6.10.1  –  <6.12.19
linuxlinux_kernel*≥6.13  –  <6.13.7
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/197e78076c5ecd895f109158c4ea2954b9919af6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/319529e0356bd904528c64647725a2272d297c83
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/903b80c21458bb1e34c3a78c5fdc553821e357f8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0475a885d69849b1ade38add6d64338dfa83a8f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf4409f84023b52b5e9b36c0a071a121eee42138
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c90aad369899a607cfbc002bebeafd51e31900cd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cfc295f7cccf66cbd5123416bcf1bee2e1bd37de
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dcd592ab9dd8a2bfc36e75583b9006db2a77ec24
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Remediation

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