AZL-56387
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-56387.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-56387
- Upstream
- Published
- 2025-01-31T12:15:28Z
- Modified
- 2026-04-01T05:18:53.068367Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2025-21676 affecting package kernel for versions less than 6.6.76.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: fec: handle pagepooldevallocpages error
The fecenetupdatecbd function calls pagepooldevallocpages but did not handle the case when it returned NULL. There was a WARNON(!new_page) but it would still proceed to use the NULL pointer and then crash.
This case does seem somewhat rare but when the system is under memory pressure it can happen. One case where I can duplicate this with some frequency is when writing over a smbd share to a SATA HDD attached to an imx6q.
Setting /proc/sys/vm/minfreekbytes to higher values also seems to solve the problem for my test case. But it still seems wrong that the fec driver ignores the memory allocation error and can crash.
This commit handles the allocation error by dropping the current packet.
- References