High severity7.8NVD Advisory· Published Mar 7, 2025· Updated Jul 30, 2026

CVE-2025-21836

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Linux/Kernel5 versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.19,<6.6.79
- cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
- (no CPE)
- (no CPE)range: 5.19
osv-coords80 versions
pkg:deb/ubuntu/[email protected]?arch=source&distro=oracular pkg:linux/kernel pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-rt_debug&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.6 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7 pkg:rpm/suse/kernel-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-coco_debug&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-MICRO-6-0-RT_Update_7&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-livepatch-MICRO-6-0-RT_Update_7&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-MICRO-6-0_Update_6&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-livepatch-MICRO-6-0_Update_6&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-SLE15-SP6-RT_Update_11&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-livepatch-SLE15-SP6_Update_11&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-livepatch-SLE15-SP7_Update_1&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7 pkg:rpm/suse/kernel-source-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7 pkg:rpm/suse/kernel-syms-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7
< 6.11.0-1014.15+ 79 more
- (no CPE)range: < 6.11.0-1014.15
- (no CPE)range: >= 5.19.0, < 6.6.79
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.8.37.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1.150600.12.22.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.8.37.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.8.37.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.8.37.1
- (no CPE)range: < 6.4.0-150700.20.3.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-150600.23.50.1.150600.12.22.1
- (no CPE)range: < 6.4.0-150700.53.3.1.150700.17.2.1
- (no CPE)range: < 6.4.0-28.1.21.6
- (no CPE)range: < 6.4.0-28.1.21.6
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 1-1.3
- (no CPE)range: < 1-1.3
- (no CPE)range: < 1-3.1
- (no CPE)range: < 1-3.1
- (no CPE)range: < 1-150600.1.3.2
- (no CPE)range: < 1-150600.13.3.1
- (no CPE)range: < 1-150700.15.3.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-150600.8.37.1
- (no CPE)range: < 6.4.0-150700.20.3.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.8.37.1
- (no CPE)range: < 6.4.0-150700.20.3.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.50.1
- (no CPE)range: < 6.4.0-150700.53.3.1

cvss	0.507
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

CVE-2025-21836

Description

AI Insight

Affected products

Patches

Vulnerability mechanics

References

News mentions