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🛡️ CVE-2026-31596 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ocfs2: handle invalid dinode in ocfs2_group_extend

In the Linux kernel, the following vulnerability has been resolved:

ocfs2: handle invalid dinode in ocfs2_group_extend

[BUG]

kernel BUG at fs/ocfs2/resize.c:308!

Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI

RIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308

Code: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe

Call Trace:

...

ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:597 [inline]

__se_sys_ioctl fs/ioctl.c:583 [inline]

__x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583

x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x76/0x7e

...

[CAUSE]

ocfs2_group_extend() assumes that the global bitmap inode block

returned from ocfs2_inode_lock() has already been validated and

BUG_ONs when the signature is not a dinode. That assumption is too

strong for crafted filesystems because the JBD2-managed buffer path

can bypass structural validation and return an invalid dinode to the

resize ioctl.

[FIX]

Validate the dinode explicitly in ocfs2_group_extend(). If the global

bitmap buffer does not contain a valid dinode, report filesystem

corruption with ocfs2_error() and fail the resize operation instead of

crashing the kernel.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-31596 is recorded against 2 packages.

  • kernel (from 6.20.0 up to 7.0.1)
  • linux-kernel (from 7.0 up to 7.0.1)

Timeline and source

Published on 24 April 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31596 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-24
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.20.0 7.0.1
linux-kernel 7.0 7.0.1

References

Similar Threats

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