CVE-2025-21858 — Use After Free in Linux

CWE-416 — Use After Free84 documents7 sources
Severity
7.8HIGHNVD
OSV8.8OSV7.1OSV5.9OSV5.5
EPSS
0.0%
top 86.56%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
8
LinuxLinux KernelDebian Linux+5 more
Timeline
PublishedMar 12
Latest updateSep 3

Description

In the Linux kernel, the following vulnerability has been resolved: geneve: Fix use-after-free in geneve_find_dev(). syzkaller reported a use-after-free in geneve_find_dev() [0] without repro. geneve_configure() links struct geneve_dev.next to net_generic(net, geneve_net_id)->geneve_list. The net here could differ from dev_net(dev) if IFLA_NET_NS_PID, IFLA_NET_NS_FD, or IFLA_TARGET_NETNSID is set. When dev_net(dev) is dismantled, geneve_exit_batch_rtnl() finally calls unregister_netdevice_q…

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 Packages10 packages

▶NVDlinux/linux_kernel4.2 — 6.1.130+4
▶Debianlinux/linux_kernel< 5.10.237-1+3
▶Ubuntulinux/linux_kernel< 5.4.0-216.236+2

Patches

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

🔴Vulnerability Details

41
OSV
linux-azure, linux-azure-6.8, linux-azure-nvidia vulnerabilities↗2025-09-03
▶
OSV
linux-gke, linux-hwe-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-raspi vulnerabilities↗2025-08-28
▶
OSV
linux-raspi-realtime vulnerabilities↗2025-08-26
▶
OSV
linux-oracle, linux-oracle-6.8 vulnerabilities↗2025-08-21
▶
OSV
linux-aws-6.8, linux-gcp, linux-gcp-6.8, linux-gkeop, linux-ibm, linux-ibm-6.8 vulnerabilities↗2025-08-20
▶

📋Vendor Advisories

42
Ubuntu
Linux kernel (Azure) vulnerabilities↗2025-09-03
▶
Ubuntu
Linux kernel vulnerabilities↗2025-08-28
▶
Ubuntu
Linux kernel (Raspberry Pi Real-time) vulnerabilities↗2025-08-26
▶
Ubuntu
Linux kernel (Oracle) vulnerabilities↗2025-08-21
▶
Ubuntu
Linux kernel vulnerabilities↗2025-08-20
▶
CVE-2025-21858 — Use After Free in Linux | cvebase