Medium 5.5Published Mar 25, 2026

CVE-2026-23298can: ucan: Fix infinite loop from zero-length messages

Updated under an hour ago (Oct 28, 2026, 7:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: can: ucan: Fix infinite loop from zero-length messages If a broken ucan device gets a message with the message length field set to 0, then the driver will loop for forever in ucan_read_bulk_callback(), hanging the system. If the length is 0, just skip the message and go on to the next one. This has been fixed in the kvaser_usb driver in the past in commit 0c73772cd2b8 ("can: kvaser_usb: leaf: Fix potential infinite loop in command parsers"), so there must be some broken devices out there like this somewhere.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before ca07d3c6eef14d34e6fdeefe55058db045be29dc; from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before e7bb6e0606b5f233531aaaad9542d69fbb792115; from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before ab6f075492d37368b4c7b0df7f7fdc2b666887fc; from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before 13b646eec3ba1131180803f5aaf1fee23540ad8f; from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before bd85f21a6219aeae4389d700c54f1799f4b814e0; from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before aa9e0a7fe5efc2f74327fd37d828e9a51d9ff588; from 9f2d3eae88d26c29d96e42983b755940d9169cd9 before c7bc62be6c1a60bb21301692009590b1ffda91d9; 9f2d3eae88d26c29d96e42983b755940d9169cd9 builds before 1e446fd0582ad8be9f6dafb115fc2e7245f9bea7	CNA record
linux linux_kernel linux:linux_kernel	from 4.19 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 7.0; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/ca07d3c6eef14d34e6fdeefe55058db045be29dc	patch
https://git.kernel.org/stable/c/e7bb6e0606b5f233531aaaad9542d69fbb792115	patch
https://git.kernel.org/stable/c/ab6f075492d37368b4c7b0df7f7fdc2b666887fc	patch
https://git.kernel.org/stable/c/13b646eec3ba1131180803f5aaf1fee23540ad8f	patch
https://git.kernel.org/stable/c/bd85f21a6219aeae4389d700c54f1799f4b814e0	patch
https://git.kernel.org/stable/c/aa9e0a7fe5efc2f74327fd37d828e9a51d9ff588	patch
https://git.kernel.org/stable/c/c7bc62be6c1a60bb21301692009590b1ffda91d9	patch
https://git.kernel.org/stable/c/1e446fd0582ad8be9f6dafb115fc2e7245f9bea7	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.