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Fencer Vulns
medium 5.5

CVE-2025-21997 json

xsk: fix an integer overflow in xp_create_and_assign_umem()

published 2025-04-03 19 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-9589

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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

xsk: fix an integer overflow in xp_create_and_assign_umem()

Since the i and pool->chunk_size variables are of type 'u32', their product can wrap around and then be cast to 'u64'. This can lead to two different XDP buffers pointing to the same memory area.

Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

Patch / fix

  • Linux Linux 6.1.132, 6.6.85, 6.12.21, 6.13.9, 6.14
  • linux Debian 12 6.1.133-1
  • linux Debian 14, Debian 13 6.12.21-1

debian advisories DEBIAN-CVE-2025-21997

  • linux Ubuntu 24.04 LTS 6.8.0-84.84
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1039.41
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1040.42
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1036.40
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1037.37
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1038.44
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1023.25
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1039.43

ubuntu advisories UBUNTU-CVE-2025-21997

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 10.0 6.12.0-55.16.1.el10_0
  • rv RHEL 10.0 6.12.0-55.16.1.el10_0
  • perf RHEL 10.0 6.12.0-55.16.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.16.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.16.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.16.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.16.1.el10_0
  • kernel-core RHEL 10.0 6.12.0-55.16.1.el10_0

red hat advisories RHSA-2025:8669RHSA-2025:8643

  • kernel-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-syms-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-coco_debug SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-source-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • dtb-aarch64 openSUSE Leap 15.6 6.4.0-150600.23.60.3
  • kernel-64kb SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 6.4.0-150600.23.60.4
  • kernel-syms SLE Module for Development Tools 15 SP6, openSUSE Leap 15.6 6.4.0-150600.23.60.4
  • kernel-obs-qa openSUSE Leap 15.6 6.4.0-150600.23.60.2

suse advisories SUSE-SU-2025:02923-1SUSE-SU-2025:02538-1SUSE-SU-2025:02335-1SUSE-SU-2025:02333-1SUSE-SU-2025:02307-1SUSE-SU-2025:02254-1

  • kernel AlmaLinux 9 5.14.0-570.21.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.21.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.21.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.21.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.21.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.21.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.21.1.el9_6
  • kernel-core AlmaLinux 9 5.14.0-570.21.1.el9_6

almalinux advisories ALSA-2025:8643

  • kernel Rocky Linux 9 5.14.0-570.21.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.16.1.el10_0

rocky linux advisories RLSA-2025:8643RLSA-2025:8669

  • kernel Azure Linux 3.0 6.6.85.1-2

azure linux advisories AZL-59904

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2025-21997 updated cvss 7.1

kernel: xsk: fix an integer overflow in xp_create_and_assign_umem()

  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.21.1.el9_6, perf 5.14.0-570.21.1.el9_6, rtla 5.14.0-570.21.1.el9_6, python3-perf 5.14.0-570.21.1.el9_6, kernel-devel-matched 5.14.0-570.21.1.el9_6, kernel-64k-devel-matched 5.14.0-570.21.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:8643
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.16.1.el10_0, perf 6.12.0-55.16.1.el10_0, rtla 6.12.0-55.16.1.el10_0, python3-perf 6.12.0-55.16.1.el10_0, kernel-devel-matched 6.12.0-55.16.1.el10_0, kernel-64k-devel-matched 6.12.0-55.16.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:8669
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.21.1.el9_6, kernel-64k 5.14.0-570.21.1.el9_6, kernel-core 5.14.0-570.21.1.el9_6, kernel-tools 5.14.0-570.21.1.el9_6, kernel-modules 5.14.0-570.21.1.el9_6, kernel-64k-core 5.14.0-570.21.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:8643
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.16.1.el10_0, kernel-64k 6.12.0-55.16.1.el10_0, kernel-core 6.12.0-55.16.1.el10_0, kernel-tools 6.12.0-55.16.1.el10_0, kernel-modules 6.12.0-55.16.1.el10_0, kernel-64k-core 6.12.0-55.16.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:8669
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.21.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.21.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.21.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.21.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.21.1.el9_6
    fixed: vendor fix RHSA-2025:8643
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.16.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.16.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.16.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.16.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.16.1.el10_0
    fixed: vendor fix RHSA-2025:8669
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.21.1.el9_6, kernel-rt-64k 5.14.0-570.21.1.el9_6, kernel-rt-core 5.14.0-570.21.1.el9_6, kernel-rt-modules 5.14.0-570.21.1.el9_6, kernel-rt-64k-core 5.14.0-570.21.1.el9_6, kernel-rt-debug-core 5.14.0-570.21.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:8643
show 4 more
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.16.1.el10_0, kernel-rt-64k 6.12.0-55.16.1.el10_0, kernel-rt-core 6.12.0-55.16.1.el10_0, kernel-rt-modules 6.12.0-55.16.1.el10_0, kernel-rt-64k-core 6.12.0-55.16.1.el10_0, kernel-rt-debug-core 6.12.0-55.16.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:8669
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.21.1.el9_6, kernel-rt-kvm 5.14.0-570.21.1.el9_6, kernel-rt-core 5.14.0-570.21.1.el9_6, kernel-rt-modules 5.14.0-570.21.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.21.1.el9_6, kernel-rt-debug-core 5.14.0-570.21.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:8643
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.16.1.el10_0, kernel-rt-kvm 6.12.0-55.16.1.el10_0, kernel-rt-core 6.12.0-55.16.1.el10_0, kernel-rt-modules 6.12.0-55.16.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.16.1.el10_0, kernel-rt-debug-core 6.12.0-55.16.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:8669
  • 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
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
13 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Weakness
  • CWE-190 Integer Overflow or Wraparound
Technology feeds

References

Sources

Fencer Vulns 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.