CVE-2021-47276
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47276
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47276.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47276
- Related
- Published
- 2024-05-21T15:15:15Z
- Modified
- 2024-09-18T01:00:22Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ftrace: Do not blindly read the ip address in ftrace_bug()
It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftraceinit(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftracebug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address.
Instead, read the ip address with copyfromkernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.
- References
-
- https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28
- https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875
- https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b
- https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051
- https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2
- https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb
- https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81
- https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7
- https://security-tracker.debian.org/tracker/CVE-2021-47276
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
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