Medium 5.5Published Apr 24, 2026

CVE-2026-31596ocfs2: handle invalid dinode in ocfs2_group_extend

Updated under an hour ago (Oct 27, 2026, 10:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Jun 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	10995aa2451afa20b721cc7de856cae1a13dba57 builds before 7eafcf507fbd68f3276c00f6c02ef155ad69f79b; from 10995aa2451afa20b721cc7de856cae1a13dba57 before fabfa6b81bd386154d7e59f8cd8f760f9e68b48c; from 10995aa2451afa20b721cc7de856cae1a13dba57 before b328d8e7c437d0f026ba2c13788af6eae77700f1; 10995aa2451afa20b721cc7de856cae1a13dba57 builds before 6575f9fbf084502b7118a628425bf7866666498d; 10995aa2451afa20b721cc7de856cae1a13dba57 builds before 911b557dd7817460881fd51a03069b539c674d0e; from 10995aa2451afa20b721cc7de856cae1a13dba57 before e384a850a3370d89a7a446cdeccd964bfba2a302; 10995aa2451afa20b721cc7de856cae1a13dba57 builds before 10fb72c47aac446f12a4ccd962c7daa60cc890a1; 10995aa2451afa20b721cc7de856cae1a13dba57 builds before 41c6e9bc3a09539deab43957a3211d902a4818f0; and 1 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.29 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1	NVD

References

References

https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b
https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c
https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1
https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d	patch
https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e	patch
https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302	patch
https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1	patch
https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0	patch
https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.