CVE-2024-26946

In the Linux kernel, the following vulnerability has been resolved:

kprobes/x86: Use copy_from_kernel_nofault() to read from unsafe address

Read from an unsafe address with copy_from_kernel_nofault() in arch_adjust_kprobe_addr() because this function is used before checking the address is in text or not. Syzcaller bot found a bug and reported the case if user specifies inaccessible data area, arch_adjust_kprobe_addr() will cause a kernel panic.

[ mingo: Clarified the comment. ]

Weakness

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Software

Extended Description

While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.

Potential Mitigations

References

• https://git.kernel.org/stable/c/20fdb21eabaeb8f78f8f701f56d14ea0836ec861
• https://git.kernel.org/stable/c/4e51653d5d871f40f1bd5cf95cc7f2d8b33d063b
• https://git.kernel.org/stable/c/6417684315087904fffe8966d27ca74398c57dd6
• https://git.kernel.org/stable/c/b69f577308f1070004cafac106dd1a44099e5483
• https://git.kernel.org/stable/c/f13edd1871d4fb4ab829aff629d47914e251bae3
• https://git.kernel.org/stable/c/20fdb21eabaeb8f78f8f701f56d14ea0836ec861
• https://git.kernel.org/stable/c/4e51653d5d871f40f1bd5cf95cc7f2d8b33d063b
• https://git.kernel.org/stable/c/6417684315087904fffe8966d27ca74398c57dd6
• https://git.kernel.org/stable/c/b69f577308f1070004cafac106dd1a44099e5483
• https://git.kernel.org/stable/c/f13edd1871d4fb4ab829aff629d47914e251bae3