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OpenAdvisories
Medium · 5.5 CVE-2025-39822 EUVD-2025-29592GHSA-5xmf-424g-jjhg

io_uring/kbuf: fix signedness in this_len calculation

Published Sep 16, 2025 · Updated May 11, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-nvidia-6.14 Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.19 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-intel Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.5 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.5 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

io_uring/kbuf: fix signedness in this_len calculation

When importing and using buffers, buf->len is considered unsigned.
However, buf->len is converted to signed int when committing. This can
lead to unexpected behavior if the buffer is large enough to be
interpreted as a negative value. Make min_t calculation unsigned.

Affected products

VendorProductAffectedFixed
Linux Linux 6.15 6.16.5

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 6.16.5-1 —
Debian 13 linux No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 25.10 linux-azure-fde No fix yet —
Ubuntu 24.04 LTS linux-intel +18 No fix yet —
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 No fix yet —

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +5 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1
SLES 15 SP7 kernel-azure +2 6.4.0-150700.20.21.1 SUSE-SU-2025:4517-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.25.1.150700.17.17.1 SUSE-SU-2025:4393-1
SLES 15 SP7 kernel-docs 6.4.0-150700.53.25.2 SUSE-SU-2025:4393-1
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +7 6.12.0-160000.8.1 SUSE-SU-2026:20015-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20015-1
SLES 16.0 kernel-64kb +7 6.12.0-160000.8.1 SUSE-SU-2026:20021-1, SUSE-SU-2026:20015-1
SLES 16.0 kernel-default-base 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20015-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20012-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.8.1 SUSE-SU-2026:20562-1, SUSE-SU-2026:20012-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_7 1-150700.1.3.1 SUSE-SU-2025:4516-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_7 1-150700.15.3.1 SUSE-SU-2025:4393-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.25.1 SUSE-SU-2025:4516-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.8.1.160000.2.5 openSUSE-SU-2025:20172-1
openSUSE Leap 16.0 kernel-rt +10 6.12.0-160000.8.1 openSUSE-SU-2025:20172-1

Advisories 9

References