CVE-2025-21812 — Use After Free in Linux

CWE-416 — Use After Free30 documents7 sources
Severity
7.8HIGHNVD
OSV7.1OSV5.9OSV5.5
EPSS
0.0%
top 93.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
LinuxLinux KernelDebian Linux+2 more
Timeline
PublishedFeb 27
Latest updateSep 3

Description

In the Linux kernel, the following vulnerability has been resolved: ax25: rcu protect dev->ax25_ptr syzbot found a lockdep issue [1]. We should remove ax25 RTNL dependency in ax25_setsockopt() This should also fix a variety of possible UAF in ax25. [1] WARNING: possible circular locking dependency detected 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Not tainted syz.5.1818/12806 is trying to acquire lock: ffffffff8fcb3988 (rtnl_mutex){+.+.}-{4:4}, at: ax25_setsockopt+0xa55/0xe90 net/ax25/af…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages7 packages

▶NVDlinux/linux_kernel3.18.132 — 3.19+8
▶Debianlinux/linux_kernel< 6.1.129-1+2
▶Ubuntulinux/linux_kernel< 6.8.0-64.67
▶CVEListV5linux/linuxc433570458e49bccea5c551df628d058b3526289 — 2802ed4ced27ebd474828fc67ffd7d66f11e3605+11

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

14
OSV
linux-azure, linux-azure-6.8, linux-azure-nvidia vulnerabilities↗2025-09-03
▶
OSV
linux-raspi vulnerabilities↗2025-07-24
▶
OSV
linux-raspi-realtime vulnerabilities↗2025-07-24
▶
OSV
linux-gcp, linux-gcp-6.8 vulnerabilities↗2025-07-22
▶
OSV
linux-aws-6.8, linux-gke, linux-gkeop, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oracle, linux-oracle-6.8 vulnerabilities↗2025-07-22
▶

📋Vendor Advisories

15
Ubuntu
Linux kernel (Azure) vulnerabilities↗2025-09-03
▶
Ubuntu
Linux kernel (Raspberry Pi Real-time) vulnerabilities↗2025-07-24
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2025-07-24
▶
Ubuntu
Linux kernel (GCP) vulnerabilities↗2025-07-22
▶
Ubuntu
Linux kernel vulnerabilities↗2025-07-22
▶
CVE-2025-21812 — Use After Free in Linux | cvebase