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Fencer Vulns
high 7.8

CVE-2025-38730 json

io_uring/net: commit partial buffers on retry

published 2025-09-04 14 mo ago modified 2026-10-19 20 d ago also EUVD-2025-26739

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 6%
public exploits
0
none known

Summary

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

io_uring/net: commit partial buffers on retry

Ring provided buffers are potentially only valid within the single execution context in which they were acquired. io_uring deals with this and invalidates them on retry. But on the networking side, if MSG_WAITALL is set, or if the socket is of the streaming type and too little was processed, then it will hang on to the buffer rather than recycle or commit it. This is problematic for two reasons:

1) If someone unregisters the provided buffer ring before a later retry, then the req->buf_list will no longer be valid.

2) If multiple sockers are using the same buffer group, then multiple receives can consume the same memory. This can cause data corruption in the application, as either receive could land in the same userspace buffer.

Fix this by disallowing partial retries from pinning a provided buffer across multiple executions, if ring provided buffers are used.

Patch / fix

  • Linux Linux 6.6.103, 6.12.44, 6.15.11, 6.16.2, 6.17
  • linux Debian 13 6.12.48-1
  • linux Debian 14 6.16.3-1

debian advisories DEBIAN-CVE-2025-38730

  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1044.44
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1046.52
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1030.33
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1047.51

ubuntu advisories UBUNTU-CVE-2025-38730

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 6.12.0-124.35.1.el10_1
  • rv RHEL 10.1 6.12.0-124.35.1.el10_1
  • perf RHEL 10.1 6.12.0-124.35.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.35.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.35.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.35.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.35.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.35.1.el10_1

red hat advisories RHSA-2026:3124RHSA-2026:2766RHSA-2026:2759RHSA-2026:2282RHSA-2026:2212

  • 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-2025:21179-1SUSE-SU-2025:20870-1SUSE-SU-2025:20898-1

  • 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 AlmaLinux 9 5.14.0-611.30.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.30.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.30.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.30.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.30.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.30.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.30.1.el9_7
  • kernel-core AlmaLinux 9 5.14.0-611.30.1.el9_7

almalinux advisories ALSA-2026:2212ALSA-2026:2282

  • kernel Rocky Linux 10 6.12.0-124.35.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.30.1.el9_7

rocky linux advisories RLSA-2026:2282RLSA-2026:2212

  • kernel Azure Linux 3.0 6.6.104.2-1

azure linux advisories AZL-66830

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-2025-38730 updated cvss 7.1

kernel: Linux kernel: Data corruption and system instability due to improper io_uring/net buffer handling

  • 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: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.111.1.el9_4
    fixed: vendor fix RHSA-2026:2766
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.89.1.el9_6
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.30.1.el9_7, perf 5.14.0-611.30.1.el9_7, rtla 5.14.0-611.30.1.el9_7, python3-perf 5.14.0-611.30.1.el9_7, kernel-devel-matched 5.14.0-611.30.1.el9_7, kernel-64k-devel-matched 5.14.0-611.30.1.el9_7, +7 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.35.1.el10_1, perf 6.12.0-124.35.1.el10_1, rtla 6.12.0-124.35.1.el10_1, python3-perf 6.12.0-124.35.1.el10_1, kernel-devel-matched 6.12.0-124.35.1.el10_1, kernel-64k-devel-matched 6.12.0-124.35.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.61.1.el10_0, perf 6.12.0-55.61.1.el10_0, rtla 6.12.0-55.61.1.el10_0, python3-perf 6.12.0-55.61.1.el10_0, kernel-devel-matched 6.12.0-55.61.1.el10_0, kernel-64k-devel-matched 6.12.0-55.61.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:3124
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.111.1.el9_4, perf 5.14.0-427.111.1.el9_4, rtla 5.14.0-427.111.1.el9_4, kernel-devel-matched 5.14.0-427.111.1.el9_4, kernel-64k-devel-matched 5.14.0-427.111.1.el9_4, kernel-debug-devel-matched 5.14.0-427.111.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.89.1.el9_6, perf 5.14.0-570.89.1.el9_6, rtla 5.14.0-570.89.1.el9_6, python3-perf 5.14.0-570.89.1.el9_6, kernel-devel-matched 5.14.0-570.89.1.el9_6, kernel-64k-devel-matched 5.14.0-570.89.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:2759
show 19 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.30.1.el9_7, kernel-64k 5.14.0-611.30.1.el9_7, kernel-core 5.14.0-611.30.1.el9_7, kernel-tools 5.14.0-611.30.1.el9_7, kernel-modules 5.14.0-611.30.1.el9_7, kernel-64k-core 5.14.0-611.30.1.el9_7, +27 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.35.1.el10_1, kernel-64k 6.12.0-124.35.1.el10_1, kernel-core 6.12.0-124.35.1.el10_1, kernel-tools 6.12.0-124.35.1.el10_1, kernel-modules 6.12.0-124.35.1.el10_1, kernel-64k-core 6.12.0-124.35.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.61.1.el10_0, kernel-64k 6.12.0-55.61.1.el10_0, kernel-core 6.12.0-55.61.1.el10_0, kernel-tools 6.12.0-55.61.1.el10_0, kernel-modules 6.12.0-55.61.1.el10_0, kernel-64k-core 6.12.0-55.61.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:3124
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.111.1.el9_4, kernel 5.14.0-427.111.1.el9_4, kernel-64k 5.14.0-427.111.1.el9_4, kernel-core 5.14.0-427.111.1.el9_4, kernel-tools 5.14.0-427.111.1.el9_4, python3-perf 5.14.0-427.111.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.89.1.el9_6, kernel-64k 5.14.0-570.89.1.el9_6, kernel-core 5.14.0-570.89.1.el9_6, kernel-tools 5.14.0-570.89.1.el9_6, kernel-modules 5.14.0-570.89.1.el9_6, kernel-64k-core 5.14.0-570.89.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.30.1.el9_7
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.35.1.el10_1
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.61.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.61.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.61.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.61.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.61.1.el10_0
    fixed: vendor fix RHSA-2026:3124
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.30.1.el9_7, kernel-rt-64k 5.14.0-611.30.1.el9_7, kernel-rt-core 5.14.0-611.30.1.el9_7, kernel-rt-modules 5.14.0-611.30.1.el9_7, kernel-rt-64k-core 5.14.0-611.30.1.el9_7, kernel-rt-debug-core 5.14.0-611.30.1.el9_7, +14 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.35.1.el10_1, kernel-rt-64k 6.12.0-124.35.1.el10_1, kernel-rt-core 6.12.0-124.35.1.el10_1, kernel-rt-modules 6.12.0-124.35.1.el10_1, kernel-rt-64k-core 6.12.0-124.35.1.el10_1, kernel-rt-debug-core 6.12.0-124.35.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.61.1.el10_0, kernel-rt-64k 6.12.0-55.61.1.el10_0, kernel-rt-core 6.12.0-55.61.1.el10_0, kernel-rt-modules 6.12.0-55.61.1.el10_0, kernel-rt-64k-core 6.12.0-55.61.1.el10_0, kernel-rt-debug-core 6.12.0-55.61.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:3124
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.111.1.el9_4, kernel-rt-core 5.14.0-427.111.1.el9_4, kernel-rt-modules 5.14.0-427.111.1.el9_4, kernel-rt-debug-core 5.14.0-427.111.1.el9_4, kernel-rt-modules-core 5.14.0-427.111.1.el9_4, kernel-rt-debug-modules 5.14.0-427.111.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.89.1.el9_6, kernel-rt-64k 5.14.0-570.89.1.el9_6, kernel-rt-core 5.14.0-570.89.1.el9_6, kernel-rt-modules 5.14.0-570.89.1.el9_6, kernel-rt-64k-core 5.14.0-570.89.1.el9_6, kernel-rt-debug-core 5.14.0-570.89.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.30.1.el9_7, kernel-rt-core 5.14.0-611.30.1.el9_7, kernel-rt-modules 5.14.0-611.30.1.el9_7, kernel-rt-debug-core 5.14.0-611.30.1.el9_7, kernel-rt-modules-core 5.14.0-611.30.1.el9_7, kernel-rt-debug-modules 5.14.0-611.30.1.el9_7, +4 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.35.1.el10_1, kernel-rt-core 6.12.0-124.35.1.el10_1, kernel-rt-modules 6.12.0-124.35.1.el10_1, kernel-rt-debug-core 6.12.0-124.35.1.el10_1, kernel-rt-modules-core 6.12.0-124.35.1.el10_1, kernel-rt-debug-modules 6.12.0-124.35.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.61.1.el10_0, kernel-rt-kvm 6.12.0-55.61.1.el10_0, kernel-rt-core 6.12.0-55.61.1.el10_0, kernel-rt-modules 6.12.0-55.61.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.61.1.el10_0, kernel-rt-debug-core 6.12.0-55.61.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:3124
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.111.1.el9_4, kernel-rt-kvm 5.14.0-427.111.1.el9_4, kernel-rt-core 5.14.0-427.111.1.el9_4, kernel-rt-modules 5.14.0-427.111.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.111.1.el9_4, kernel-rt-debug-core 5.14.0-427.111.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.89.1.el9_6, kernel-rt-kvm 5.14.0-570.89.1.el9_6, kernel-rt-core 5.14.0-570.89.1.el9_6, kernel-rt-modules 5.14.0-570.89.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.89.1.el9_6, kernel-rt-debug-core 5.14.0-570.89.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:2759
  • 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% 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
NVD 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

Weakness
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.