CVE-2024-26818 tools/rtla: Fix clang warning about mount_point var size
A buffer overflow in the Linux kernel's rtla tool allows attackers to potentially execute code or cause a denial of service via crafted input.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-26818?
CVE-2024-26818 is a medium-severity memory corruption vulnerability in Linux kernel, published on 17 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
tools/rtla: Fix clang warning about mount_point var size
clang is reporting this warning:
$ make HOSTCC=clang CC=clang LLVM_IAS=1 [...] clang -O -g -DVERSION=\"6.8.0-rc3\" -flto=auto -fexceptions -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS $(pkg-config --cflags libtracefs) -c -o src/utils.o src/utils.c
src/utils.c:548:66: warning: 'fscanf' may overflow; destination buffer in argument 3 has size 1024, but the corresponding specifier may require size 1025 [-Wfortify-source] 548 | while (fscanf(fp, "%*s %" STR(MAX_PATH) "s %99s %*s %*d %*d\n", mount_point, type) == 2) { | ^
Increase mount_point variable size to MAX_PATH+1 to avoid the overflow.
Which versions are affected by CVE-2024-26818?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26818?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2024-26818 being exploited?
There is no known exploitation of CVE-2024-26818 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-26818, DEBIAN-CVE-2024-26818, GHSA-3264-p6rp-pxp7, UBUNTU-CVE-2024-26818.