linux: In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ft...
CVE-2021-47276 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47276, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.10.46-1 | DEBIAN-CVE-2021-47276 | May 21, 2024 |
| linux · Debian 13.5 (trixie) | 5.10.46-1 | DEBIAN-CVE-2021-47276 | May 21, 2024 |
| linux · Debian 14 | 5.10.46-1 | DEBIAN-CVE-2021-47276 | May 21, 2024 |
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