CVE-2021-47556
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47556
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47556.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47556
- Related
- Published
- 2024-05-24T15:15:20Z
- Modified
- 2024-09-18T01:00:22Z
- 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
- [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