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Fencer Vulns
high 7.8

CVE-2025-40047 json

io_uring/waitid: always prune wait queue entry in io_waitid_wait()

published 2025-10-28 12 mo ago modified 2026-10-19 20 d ago also EUVD-2025-36481

cvss
7.8
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 5%
public exploits
0
none known

Summary

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

io_uring/waitid: always prune wait queue entry in io_waitid_wait()

For a successful return, always remove our entry from the wait queue entry list. Previously this was skipped if a cancelation was in progress, but this can race with another invocation of the wait queue entry callback.

Patch / fix

  • Linux Linux 6.12.53, 6.17.3, 6.18
  • linux Debian 13 6.12.57-1
  • linux Debian 14 6.17.6-1

debian advisories DEBIAN-CVE-2025-40047

  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux Ubuntu 25.10 6.17.0-14.14
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-aws Ubuntu 25.10 6.17.0-1007.7
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-gcp Ubuntu 25.10 6.17.0-1007.7
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1048.53
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1049.49

ubuntu advisories UBUNTU-CVE-2025-40047

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 6.12.0-124.20.1.el10_1
  • rv RHEL 10.1 6.12.0-124.20.1.el10_1
  • perf RHEL 10.1 6.12.0-124.20.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.20.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.20.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.20.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.20.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.20.1.el10_1

red hat advisories RHSA-2026:1727RHSA-2025:22854RHSA-2025:21933RHSA-2025:21469

  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.21.1
  • kernel-syms-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.21.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.21.1
  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.25.1
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.25.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.25.1
  • kernel-rt Linux Micro 6.2 6.12.0-160000.8.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.8.1

suse advisories SUSE-SU-2025:4517-1SUSE-SU-2025:4516-1SUSE-SU-2026:20012-1SUSE-SU-2026:20015-1SUSE-SU-2026:20021-1SUSE-SU-2026:20562-1

  • kernel-source-longterm openSUSE Tumbleweed 6.18.16-1.1
  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.8.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.8.1

opensuse advisories openSUSE-SU-2026:10301-1openSUSE-SU-2025:20172-1openSUSE-SU-2025:15702-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.20.1.el10_1

almalinux advisories ALSA-2025:22854

  • kernel Rocky Linux 10 6.12.0-124.20.1.el10_1

rocky linux advisories RLSA-2025:22854

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-2025-40047 updated cvss 7.8

kernel: io_uring/waitid: always prune wait queue entry in io_waitid_wait()

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.66.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.66.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.66.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.66.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.66.1.el9_6
    fixed: vendor fix RHSA-2025:21933
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.8.1.el9_7, perf 5.14.0-611.8.1.el9_7, rtla 5.14.0-611.8.1.el9_7, python3-perf 5.14.0-611.8.1.el9_7, kernel-devel-matched 5.14.0-611.8.1.el9_7, kernel-64k-devel-matched 5.14.0-611.8.1.el9_7, +7 more
    fixed: vendor fix RHSA-2025:21469
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.20.1.el10_1, perf 6.12.0-124.20.1.el10_1, rtla 6.12.0-124.20.1.el10_1, python3-perf 6.12.0-124.20.1.el10_1, kernel-devel-matched 6.12.0-124.20.1.el10_1, kernel-64k-devel-matched 6.12.0-124.20.1.el10_1, +7 more
    fixed: vendor fix RHSA-2025:22854
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.58.1.el10_0, perf 6.12.0-55.58.1.el10_0, rtla 6.12.0-55.58.1.el10_0, python3-perf 6.12.0-55.58.1.el10_0, kernel-devel-matched 6.12.0-55.58.1.el10_0, kernel-64k-devel-matched 6.12.0-55.58.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.66.1.el9_6, perf 5.14.0-570.66.1.el9_6, rtla 5.14.0-570.66.1.el9_6, python3-perf 5.14.0-570.66.1.el9_6, kernel-devel-matched 5.14.0-570.66.1.el9_6, kernel-64k-devel-matched 5.14.0-570.66.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:21933
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.8.1.el9_7, kernel-64k 5.14.0-611.8.1.el9_7, kernel-core 5.14.0-611.8.1.el9_7, kernel-tools 5.14.0-611.8.1.el9_7, kernel-modules 5.14.0-611.8.1.el9_7, kernel-64k-core 5.14.0-611.8.1.el9_7, +27 more
    fixed: vendor fix RHSA-2025:21469
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.20.1.el10_1, kernel-64k 6.12.0-124.20.1.el10_1, kernel-core 6.12.0-124.20.1.el10_1, kernel-tools 6.12.0-124.20.1.el10_1, kernel-modules 6.12.0-124.20.1.el10_1, kernel-64k-core 6.12.0-124.20.1.el10_1, +28 more
    fixed: vendor fix RHSA-2025:22854
show 14 more
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.58.1.el10_0, kernel-64k 6.12.0-55.58.1.el10_0, kernel-core 6.12.0-55.58.1.el10_0, kernel-tools 6.12.0-55.58.1.el10_0, kernel-modules 6.12.0-55.58.1.el10_0, kernel-64k-core 6.12.0-55.58.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.66.1.el9_6, kernel-64k 5.14.0-570.66.1.el9_6, kernel-core 5.14.0-570.66.1.el9_6, kernel-tools 5.14.0-570.66.1.el9_6, kernel-modules 5.14.0-570.66.1.el9_6, kernel-64k-core 5.14.0-570.66.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:21933
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.8.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.8.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.8.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.8.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.8.1.el9_7
    fixed: vendor fix RHSA-2025:21469
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.20.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.20.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.20.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.20.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.20.1.el10_1
    fixed: vendor fix RHSA-2025:22854
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.58.1.el10_0
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.8.1.el9_7, kernel-rt-64k 5.14.0-611.8.1.el9_7, kernel-rt-core 5.14.0-611.8.1.el9_7, kernel-rt-modules 5.14.0-611.8.1.el9_7, kernel-rt-64k-core 5.14.0-611.8.1.el9_7, kernel-rt-debug-core 5.14.0-611.8.1.el9_7, +14 more
    fixed: vendor fix RHSA-2025:21469
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.20.1.el10_1, kernel-rt-64k 6.12.0-124.20.1.el10_1, kernel-rt-core 6.12.0-124.20.1.el10_1, kernel-rt-modules 6.12.0-124.20.1.el10_1, kernel-rt-64k-core 6.12.0-124.20.1.el10_1, kernel-rt-debug-core 6.12.0-124.20.1.el10_1, +14 more
    fixed: vendor fix RHSA-2025:22854
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.58.1.el10_0, kernel-rt-64k 6.12.0-55.58.1.el10_0, kernel-rt-core 6.12.0-55.58.1.el10_0, kernel-rt-modules 6.12.0-55.58.1.el10_0, kernel-rt-64k-core 6.12.0-55.58.1.el10_0, kernel-rt-debug-core 6.12.0-55.58.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.66.1.el9_6, kernel-rt-64k 5.14.0-570.66.1.el9_6, kernel-rt-core 5.14.0-570.66.1.el9_6, kernel-rt-modules 5.14.0-570.66.1.el9_6, kernel-rt-64k-core 5.14.0-570.66.1.el9_6, kernel-rt-debug-core 5.14.0-570.66.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:21933
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.8.1.el9_7, kernel-rt-core 5.14.0-611.8.1.el9_7, kernel-rt-modules 5.14.0-611.8.1.el9_7, kernel-rt-debug-core 5.14.0-611.8.1.el9_7, kernel-rt-modules-core 5.14.0-611.8.1.el9_7, kernel-rt-debug-modules 5.14.0-611.8.1.el9_7, +4 more
    fixed: vendor fix RHSA-2025:21469
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.20.1.el10_1, kernel-rt-core 6.12.0-124.20.1.el10_1, kernel-rt-modules 6.12.0-124.20.1.el10_1, kernel-rt-debug-core 6.12.0-124.20.1.el10_1, kernel-rt-modules-core 6.12.0-124.20.1.el10_1, kernel-rt-debug-modules 6.12.0-124.20.1.el10_1, +4 more
    fixed: vendor fix RHSA-2025:22854
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.58.1.el10_0, kernel-rt-kvm 6.12.0-55.58.1.el10_0, kernel-rt-core 6.12.0-55.58.1.el10_0, kernel-rt-modules 6.12.0-55.58.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.58.1.el10_0, kernel-rt-debug-core 6.12.0-55.58.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.66.1.el9_6, kernel-rt-kvm 5.14.0-570.66.1.el9_6, kernel-rt-core 5.14.0-570.66.1.el9_6, kernel-rt-modules 5.14.0-570.66.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.66.1.el9_6, kernel-rt-debug-core 5.14.0-570.66.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:21933
  • 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
    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

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

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.