CVE-2021-47276
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 ftrace_init(), but the error…
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
Description
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 ftrace_init(), 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 ftrace_bug() 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 copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-706
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28Patch
- https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875Patch
- https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09bPatch
- https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051Patch
- https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2Patch
- https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fbPatch
- https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81Patch
- https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7Patch
- https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28Patch
- https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875Patch
- https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09bPatch
- https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051Patch
- https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2Patch
- https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fbPatch
- https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81Patch
- https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.