5.5

CVE-2025-21916: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21916DEBIAN-CVE-2025-21916
Published 01-04-2025Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2025-21916 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.8% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 62 · Related 59
DLA-4178-1DLA-4193-1DSA-5900-1SUSE-SU-2025:01614-1SUSE-SU-2025:01707-1SUSE-SU-2025:01919-1

Timeline

  1. 01-04-2025
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

0.00 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu137 products
  • linuxAll versions (No fix recorded) | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-84.84
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1039.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 23926d316d2836315cb113569f91393266eb5b47, < dcd592ab9dd8a2bfc36e75583b9006db2a77ec24 | ≥ 75ddbf776dd04a09fb9e5267ead5d0c989f84506, < 319529e0356bd904528c64647725a2272d297c83 | ≥ 1aac4be1aaa5177506219f01dce5e29194e5e95a, < bf4409f84023b52b5e9b36c0a071a121eee42138 | ≥ 5584c776a1af7807ca815ee6265f2c1429fc5727, < 197e78076c5ecd895f109158c4ea2954b9919af6 | ≥ f536f09eb45e4de8d1b9accee9d992aa1846f1d4, < a0475a885d69849b1ade38add6d64338dfa83a8f | ≥ 2eabb655a968b862bc0c31629a09f0fbf3c80d51, < cfc295f7cccf66cbd5123416bcf1bee2e1bd37de | ≥ 2eabb655a968b862bc0c31629a09f0fbf3c80d51, < 903b80c21458bb1e34c3a78c5fdc553821e357f8 | ≥ 2eabb655a968b862bc0c31629a09f0fbf3c80d51, < c90aad369899a607cfbc002bebeafd51e31900cd | 5159a81924311c1ec786ad9fdef784ead8676a6a | ac9007520e392541a29daebaae8b9109007bc781 | ≥ 5.4.279, < 5.4.291 | ≥ 5.10.221, < 5.10.235 | ≥ 5.15.162, < 5.15.179 | ≥ 6.1.97, < 6.1.131 | ≥ 6.6.37, < 6.6.83 | ≥ 4.19.317, < 4.20 | ≥ 6.9.8, < 6.10 | 6.10
  • linux_kernelEOL≥ 4.19.317, < 4.20 | ≥ 5.4.279, < 5.4.291 | ≥ 5.10.221, < 5.10.235 | ≥ 5.15.162, < 5.15.179 | ≥ 6.1.97, < 6.1.131 | ≥ 6.6.37, < 6.6.83 | ≥ 6.9.8, < 6.10 | ≥ 6.10.1, < 6.12.19 | ≥ 6.13, < 6.13.7 | 6.10 | 6.10:rc6 | 6.10:rc7 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5
Debian1 product
  • linux< 6.1.133-1 | < 6.12.19-1

3 vendors · 140 products

References

62 links
Show all 62 references