CVE-2025-40040 — Uncontrolled Recursion in Linux

CWE-674 — Uncontrolled Recursion31 documents7 sources
Severity
5.5MEDIUMNVD
OSV7.8
EPSS
0.0%
top 98.51%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
7
LinuxLinux KernelDebian Linux+4 more
Timeline
PublishedOct 28
Latest updateApr 13

Description

In the Linux kernel, the following vulnerability has been resolved: mm/ksm: fix flag-dropping behavior in ksm_madvise syzkaller discovered the following crash: (kernel BUG) [ 44.607039] ------------[ cut here ]------------ [ 44.607422] kernel BUG at mm/userfaultfd.c:2067! [ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none) [ 44.609635] Hardware name: QEMU Standard PC (i440FX …

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages9 packages

▶NVDlinux/linux_kernel4.6 — 5.4.302+6
▶Debianlinux/linux_kernel< 6.1.158-1+2
▶Ubuntulinux/linux_kernel< 5.15.0-173.183+1

Patches

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

🔴Vulnerability Details

14
OSV
linux-raspi vulnerabilities↗2026-04-01
▶
OSV
linux-intel-iot-realtime vulnerabilities↗2026-03-23
▶
OSV
linux-nvidia-tegra-igx vulnerabilities↗2026-03-23
▶
OSV
linux-realtime vulnerabilities↗2026-03-17
▶
OSV
linux-aws-5.15, linux-gcp-5.15, linux-gke, linux-hwe-5.15, linux-intel-iotg-5.15, linux-lowlatency-hwe-5.15, linux-oracle-5.15 vulnerabilities↗2026-03-17
▶

📋Vendor Advisories

16
Ubuntu
Linux kernel (Azure) vulnerabilities↗2026-04-13
▶
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities↗2026-04-09
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2026-04-01
▶
Ubuntu
Linux kernel (Intel IoTG Real-time) vulnerabilities↗2026-03-23
▶
Ubuntu
Linux kernel (NVIDIA Tegra IGX) vulnerabilities↗2026-03-23
▶