CVE-2025-71139

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

kernel/kexec: fix IMA when allocation happens in CMA area

*** Bug description ***

When I tested kexec with the latest kernel, I ran into the following warning:

[ 40.712410] ————[ cut here ]———— [ 40.712576] WARNING: CPU: 2 PID: 1562 at kernel/kexec_core.c:1001 kimage_map_segment+0x144/0x198 […] [ 40.816047] Call trace: [ 40.818498] kimage_map_segment+0x144/0x198 (P) [ 40.823221] ima_kexec_post_load+0x58/0xc0 [ 40.827246] __do_sys_kexec_file_load+0x29c/0x368 […] [ 40.855423] —[ end trace 0000000000000000 ]—

*** How to reproduce ***

This bug is only triggered when the kexec target address is allocated in the CMA area. If no CMA area is reserved in the kernel, use the cma= option in the kernel command line to reserve one.

*** Root cause *** The commit 07d24902977e (kexec: enable CMA based contiguous allocation) allocates the kexec target address directly on the CMA area to avoid copying during the jump. In this case, there is no IND_SOURCE for the kexec segment. But the current implementation of kimage_map_segment() assumes that IND_SOURCE pages exist and map them into a contiguous virtual address by vmap().

*** Solution *** If IMA segment is allocated in the CMA area, use its page_address() directly.

Affected Software

References

• https://git.kernel.org/stable/c/a3785ae5d334bb71d47a593d54c686a03fb9d136
• https://git.kernel.org/stable/c/a843e4155c83211c55b1b6cc17eab27a6a2c5b6f