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medium 4.7

CVE-2025-38383 json

mm/vmalloc: fix data race in show_numa_info()

published last yr. modified 4mo ago also EUVD-2025-22620

cvss
4.7
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 2%
public exploits
0
none known

Summary

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

mm/vmalloc: fix data race in show_numa_info()

The following data-race was found in show_numa_info():

================================================================== BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show

read to 0xffff88800971fe30 of 4 bytes by task 8289 on cpu 0: show_numa_info mm/vmalloc.c:4936 [inline] vmalloc_info_show+0x5a8/0x7e0 mm/vmalloc.c:5016 seq_read_iter+0x373/0xb40 fs/seq_file.c:230 proc_reg_read_iter+0x11e/0x170 fs/proc/inode.c:299 ....

write to 0xffff88800971fe30 of 4 bytes by task 8287 on cpu 1: show_numa_info mm/vmalloc.c:4934 [inline] vmalloc_info_show+0x38f/0x7e0 mm/vmalloc.c:5016 seq_read_iter+0x373/0xb40 fs/seq_file.c:230 proc_reg_read_iter+0x11e/0x170 fs/proc/inode.c:299 ....

value changed: 0x0000008f -> 0x00000000 ==================================================================

According to this report,there is a read/write data-race because m->private is accessible to multiple CPUs. To fix this, instead of allocating the heap in proc_vmalloc_init() and passing the heap address to m->private, vmalloc_info_show() should allocate the heap.

Patch / fix

  • Linux Linux 6.12.37, 6.15.6, 6.16
  • linux Debian 14, Debian 13 6.12.37-1

debian advisories DEBIAN-CVE-2025-38383

  • linux-aws-6.14 Ubuntu 24.04 LTS 6.14.0-1015.15~24.04.1
  • linux-gcp-6.14 Ubuntu 24.04 LTS 6.14.0-1018.19~24.04.1
  • linux-oem-6.14 Ubuntu 24.04 LTS 6.14.0-1014.14
  • linux-azure-6.14 Ubuntu 24.04 LTS 6.14.0-1014.14~24.04.1
  • linux-riscv-6.14 Ubuntu 24.04 LTS 6.14.0-34.34.1~24.04.1
  • linux-oracle-6.14 Ubuntu 24.04 LTS 6.14.0-1015.15~24.04.1
  • linux-azure-nvidia-6.14 Ubuntu 24.04 LTS 6.14.0-1007.7
  • linux-realtime-6.14 Ubuntu Pro Realtime 24.04 LTS 6.14.0-1014.14~24.04.1

ubuntu advisories UBUNTU-CVE-2025-38383

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

  • kernel RHEL 10.1 6.12.0-124.29.1.el10_1
  • rv RHEL 10.1 6.12.0-124.29.1.el10_1
  • perf RHEL 10.1 6.12.0-124.29.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.29.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.29.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.29.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.29.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.29.1.el10_1

red hat advisories RHSA-2026:2761RHSA-2026:1178

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.29.1.el10_1

almalinux advisories ALSA-2026:1178

  • kernel Rocky Linux 10 6.12.0-124.29.1.el10_1

rocky linux advisories RLSA-2026:1178

Is CVE-2025-38383 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2025-38383 updated cvss 7.0

kernel: Linux kernel: Denial of Service due to data race in vmalloc's show_numa_info function

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.29.1.el10_1, perf 6.12.0-124.29.1.el10_1, rtla 6.12.0-124.29.1.el10_1, python3-perf 6.12.0-124.29.1.el10_1, kernel-devel-matched 6.12.0-124.29.1.el10_1, kernel-64k-devel-matched 6.12.0-124.29.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:1178
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.60.1.el10_0, perf 6.12.0-55.60.1.el10_0, rtla 6.12.0-55.60.1.el10_0, python3-perf 6.12.0-55.60.1.el10_0, kernel-devel-matched 6.12.0-55.60.1.el10_0, kernel-64k-devel-matched 6.12.0-55.60.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.29.1.el10_1, kernel-64k 6.12.0-124.29.1.el10_1, kernel-core 6.12.0-124.29.1.el10_1, kernel-tools 6.12.0-124.29.1.el10_1, kernel-modules 6.12.0-124.29.1.el10_1, kernel-64k-core 6.12.0-124.29.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:1178
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.60.1.el10_0, kernel-64k 6.12.0-55.60.1.el10_0, kernel-core 6.12.0-55.60.1.el10_0, kernel-tools 6.12.0-55.60.1.el10_0, kernel-modules 6.12.0-55.60.1.el10_0, kernel-64k-core 6.12.0-55.60.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.29.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.29.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.29.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.29.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.29.1.el10_1
    fixed: vendor fix RHSA-2026:1178
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.60.1.el10_0
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.29.1.el10_1, kernel-rt-64k 6.12.0-124.29.1.el10_1, kernel-rt-core 6.12.0-124.29.1.el10_1, kernel-rt-modules 6.12.0-124.29.1.el10_1, kernel-rt-64k-core 6.12.0-124.29.1.el10_1, kernel-rt-debug-core 6.12.0-124.29.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:1178
show 4 more
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.60.1.el10_0, kernel-rt-64k 6.12.0-55.60.1.el10_0, kernel-rt-core 6.12.0-55.60.1.el10_0, kernel-rt-modules 6.12.0-55.60.1.el10_0, kernel-rt-64k-core 6.12.0-55.60.1.el10_0, kernel-rt-debug-core 6.12.0-55.60.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.29.1.el10_1, kernel-rt-core 6.12.0-124.29.1.el10_1, kernel-rt-modules 6.12.0-124.29.1.el10_1, kernel-rt-debug-core 6.12.0-124.29.1.el10_1, kernel-rt-modules-core 6.12.0-124.29.1.el10_1, kernel-rt-debug-modules 6.12.0-124.29.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:1178
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.60.1.el10_0, kernel-rt-kvm 6.12.0-55.60.1.el10_0, kernel-rt-core 6.12.0-55.60.1.el10_0, kernel-rt-modules 6.12.0-55.60.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.60.1.el10_0, kernel-rt-debug-core 6.12.0-55.60.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:2761
  • 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
    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

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
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.