CVE-2025-39974

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

tracing/osnoise: Fix slab-out-of-bounds in _parse_integer_limit()

When config osnoise cpus by write() syscall, the following KASAN splat may be observed:

BUG: KASAN: slab-out-of-bounds in _parse_integer_limit+0x103/0x130 Read of size 1 at addr ffff88810121e3a1 by task test/447 CPU: 1 UID: 0 PID: 447 Comm: test Not tainted 6.17.0-rc6-dirty #288 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x55/0x70 print_report+0xcb/0x610 kasan_report+0xb8/0xf0 _parse_integer_limit+0x103/0x130 bitmap_parselist+0x16d/0x6f0 osnoise_cpus_write+0x116/0x2d0 vfs_write+0x21e/0xcc0 ksys_write+0xee/0x1c0 do_syscall_64+0xa8/0x2a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f

This issue can be reproduced by below code:

const char *cpulist = 1; int fd=open(/sys/kernel/debug/tracing/osnoise/cpus, O_WRONLY); write(fd, cpulist, strlen(cpulist));

Function bitmap_parselist() was called to parse cpulist, it require that the parameter buf must be terminated with a 0 or n. Fix this issue by adding a 0 to buf in osnoise_cpus_write().

Affected Software

References

• https://git.kernel.org/stable/c/930cb05a9e107777316b3ccf37f9556366669065
• https://git.kernel.org/stable/c/a2501032de0d1bc7971b2e43c03da534ac10ee9b