ocfs2: handle invalid dinode in ocfs2_group_extend

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Summary

CVECVE-2026-31596
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:37 UTC
Updated2026-06-01 17:16:50 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 7eafcf507fbd68f3276c00f6c02ef155ad69f79b git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 fabfa6b81bd386154d7e59f8cd8f760f9e68b48c git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 b328d8e7c437d0f026ba2c13788af6eae77700f1 git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 6575f9fbf084502b7118a628425bf7866666498d git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 911b557dd7817460881fd51a03069b539c674d0e git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 e384a850a3370d89a7a446cdeccd964bfba2a302 git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 10fb72c47aac446f12a4ccd962c7daa60cc890a1 git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 41c6e9bc3a09539deab43957a3211d902a4818f0 git Not specified
CNA Linux Linux affected 10995aa2451afa20b721cc7de856cae1a13dba57 4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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