7.8

CVE-2026-74456: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error

Received
AliasesUBUNTU-CVE-2026-74456DEBIAN-CVE-2026-74456
Published 15-08-2026Last modified 16-10-2026

Vulnerability summary

CVE-2026-74456 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · -0.05 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 10
SUSE-SU-2026:5091-1USN-8875-1USN-8875-2USN-8876-1USN-8877-1USN-8878-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer. If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer. BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285 Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0 Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free issue with interrupt buffer allocation").

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.05 pp

From 0.18% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 7.0.0-42.42
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 7.0.0-1016.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < 914c3b8fa175acf8476ad31cf04e308638e3578e | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < 5f2fa5840c34d3a558c57855781be75e03bef752 | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < b9088d581fff971a7eb1628f8dcc30df6cfef4dc | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < 525640b93d3e5f82f4ebea4730f4e0cf799522ba | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < 4bb3325075138dd5346b71589a959878b564dc0b | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < 92d0de80ca2223b9c7da78020155b6cb27824cc0 | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < dfb17bf04a764462000f11258a7c06aa92d1f261 | ≥ bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d, < 9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9 | 3.4

3 vendors · 172 products

References

22 links
Show all 22 references