CVE-2025-21658 — NULL Pointer Dereference in Linux

CWE-476 — NULL Pointer DereferenceCWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition38 documents7 sources
Severity
5.5MEDIUMNVD
OSV7.8OSV7.1OSV6.2
EPSS
0.0%
top 95.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
LinuxLinux KernelDebian Linux+2 more
Timeline
PublishedJan 21
Latest updateMay 29

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: avoid NULL pointer dereference if no valid extent tree [BUG] Syzbot reported a crash with the following call trace: BTRFS info (device loop0): scrub: started on devid 1 BUG: kernel NULL pointer dereference, address: 0000000000000208 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 106e70067 P4D 106e70067 PUD 107143067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 UID: 0 P…

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 Packages7 packages

▶NVDlinux/linux_kernel5.11 — 6.6.72+2
▶Debianlinux/linux_kernel< 6.12.10-1+1
▶Ubuntulinux/linux_kernel< 6.8.0-60.63
▶CVEListV5linux/linux42437a6386ffeaaf200731e73d723ea491f3fe7d — 24b85a8b0310e0144da9ab30be42e87e6476638a+3
▶debiandebian/linux< linux 6.12.10-1 (forky)

Patches

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

🔴Vulnerability Details

18
OSV
linux-oracle-6.8 vulnerabilities↗2025-05-29
▶
OSV
linux-hwe-6.8 vulnerabilities↗2025-05-28
▶
OSV
linux-raspi vulnerabilities↗2025-05-26
▶
OSV
linux-azure-nvidia vulnerabilities↗2025-05-20
▶
OSV
linux-raspi-realtime vulnerabilities↗2025-05-20
▶

📋Vendor Advisories

19
Ubuntu
Linux kernel (Oracle) vulnerabilities↗2025-05-29
▶
Ubuntu
Linux kernel (HWE) vulnerabilities↗2025-05-28
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2025-05-26
▶
Ubuntu
Linux kernel vulnerabilities↗2025-05-20
▶
Ubuntu
Linux kernel (Azure, N-Series) vulnerabilities↗2025-05-20
▶