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Fencer Intel
medium 5.5

CVE-2025-71139 json

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

published 9mo ago modified 4mo ago also EUVD-2026-2472

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.18.4, 6.19
  • linux Debian 14 6.18.5-1

debian advisories DEBIAN-CVE-2025-71139

  • linux Ubuntu 25.10 6.17.0-29.29
  • linux-aws Ubuntu 25.10 6.17.0-1015.15
  • linux-gcp Ubuntu 25.10 6.17.0-1018.19
  • linux-azure Ubuntu 25.10 6.17.0-1015.15
  • linux-raspi Ubuntu 25.10 6.17.0-1017.17
  • linux-riscv Ubuntu 25.10 6.17.0-29.29.1
  • linux-oracle Ubuntu 25.10 6.17.0-1014.14
  • linux-aws-6.17 Ubuntu 24.04 LTS 6.17.0-1017.17~24.04.1

ubuntu advisories UBUNTU-CVE-2025-71139

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-71139 updated

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

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.