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 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.

The following products are affected by CVE-2021-47276 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2021-47276.

URL	Resource
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://lore.kernel.org/linux-cve-announce/2024052152-CVE-2021-47276-7574@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47276
https://www.cve.org/CVERecord?id=CVE-2021-47276