DEBIAN-CVE-2021-47556
- Source
- https://security-tracker.debian.org/tracker/CVE-2021-47556
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47556.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2021-47556
- Upstream
- Published
- 2024-05-24T15:15:20Z
- Modified
- 2025-09-19T06:24:38Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved: ethtool: ioctl: fix potential NULL deref in ethtoolsetcoalesce() ethtoolsetcoalesce() now uses both the .getcoalesce() and .setcoalesce() callbacks. But the check for their availability is buggy, so changing the coalesce settings on a device where the driver provides only one of the callbacks results in a NULL pointer dereference instead of an -EOPNOTSUPP. Fix the condition so that the availability of both callbacks is ensured. This also matches the netlink code. Note that reproducing this requires some effort - it only affects the legacy ioctl path, and needs a specific combination of driver options: - have .getcoalesce() and .coalescesupported but no .setcoalesce(), or - have .setcoalesce() but no .getcoalesce(). Here eg. ethtool doesn't cause the crash as it first attempts to call ethtoolget_coalesce() and bails out on error.
- References
Affected packages
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:14 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source