CVE-2025-21836

EUVD-2025-7587
In the Linux kernel, the following vulnerability has been resolved:

io_uring/kbuf: reallocate buf lists on upgrade

IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it
was created for legacy selected buffer and has been emptied. It violates
the requirement that most of the field should stay stable after publish.
Always reallocate it instead.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.5 MEDIUM
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 1%
Affected Products (NVD)
VendorProductVersion
linuxlinux_kernel
5.19 ≤
𝑥
< 6.6.79
linuxlinux_kernel
6.7 ≤
𝑥
< 6.12.16
linuxlinux_kernel
6.13 ≤
𝑥
< 6.13.4
linuxlinux_kernel
6.14:rc1
linuxlinux_kernel
6.14:rc2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
5.10.223-1
fixed
bullseye (security)
5.10.257-1
fixed
forky
7.0.10-1
fixed
sid
7.0.10-1
fixed
trixie
6.12.86-1
fixed
trixie (security)
6.12.90-2
fixed
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
kernel-64kb
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-azure
suse enterprise sap 15 SP6
6.4.0-150600.8.37.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.20.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.8.37.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.20.3.1
fixed
kernel-default
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-default-base
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1.150600.12.22.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1.150700.17.2.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1.150600.12.22.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1.150700.17.2.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1.150600.12.22.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1.150700.17.2.1
fixed
kernel-docs
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-macros
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-obs-build
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-source
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-source-azure
suse enterprise sap 15 SP6
6.4.0-150600.8.37.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.20.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.8.37.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.20.3.1
fixed
kernel-syms
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
kernel-syms-azure
suse enterprise sap 15 SP6
6.4.0-150600.8.37.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.20.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.8.37.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.20.3.1
fixed
kernel-zfcpdump
suse enterprise desktop 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise desktop 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise sap 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise sap 15 SP7
6.4.0-150700.53.3.1
fixed
suse enterprise server 15 SP6
6.4.0-150600.23.50.1
fixed
suse enterprise server 15 SP7
6.4.0-150700.53.3.1
fixed
References
https://git.kernel.org/stable/c/146a185f6c05ee263db715f860620606303c4633
https://git.kernel.org/stable/c/2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4
https://git.kernel.org/stable/c/7d0dc28dae836caf7645fef62a10befc624dd17b
https://git.kernel.org/stable/c/8802766324e1f5d414a81ac43365c20142e85603
https://u1f383.github.io/slides/talks/2025_Hexacon-Deja_Vu_in_Linux_io_uring_Breaking_Memory_Sharing_Again_After_Generations_of_Fixes.pdf