CVE-2026-53039 - Vulnerability Details

Description

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

ocfs2: validate group add input before caching

[BUG]
OCFS2_IOC_GROUP_ADD can trigger a BUG_ON in
ocfs2_set_new_buffer_uptodate():

kernel BUG at fs/ocfs2/uptodate.c:509!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
RIP: 0010:ocfs2_set_new_buffer_uptodate+0x194/0x1e0 fs/ocfs2/uptodate.c:509
Code: ffffe88f 42b9fe4c 89e64889 dfe8b4df
Call Trace:
ocfs2_group_add+0x3f1/0x1510 fs/ocfs2/resize.c:507
ocfs2_ioctl+0x309/0x6e0 fs/ocfs2/ioctl.c:887
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
RIP: 0033:0x7bbfb55a966d

[CAUSE]
ocfs2_group_add() calls ocfs2_set_new_buffer_uptodate() on a
user-controlled group block before ocfs2_verify_group_and_input()
validates that block number. That helper is only valid for newly
allocated metadata and asserts that the block is not already present in
the chosen metadata cache. The code also uses INODE_CACHE(inode) even
though the group descriptor belongs to main_bm_inode and later journal
accesses use that cache context instead.

[FIX]
Validate the on-disk group descriptor before caching it, then add it to
the metadata cache tracked by INODE_CACHE(main_bm_inode). Keep the
validation failure path separate from the later cleanup path so we only
remove the buffer from that cache after it has actually been inserted.
This keeps the group buffer lifetime consistent across validation,
journaling, and cleanup.

Published: 2026-06-24

Score: n/a

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability resides in the Linux kernel’s OCFS2 filesystem. When a caller invokes the OCFS2_IOC_GROUP_ADD ioctl with a user‑controlled group descriptor, the kernel attempts to cache that descriptor before validating it. The code then triggers a BUG_ON in ocfs2_set_new_buffer_uptodate, causing a kernel panic and system crash.

Affected Systems

Any Linux kernel that includes the OCFS2 filesystem module and has not yet incorporated the commit that validates the group descriptor before caching. This encompasses all mainstream distributions shipping the stock kernel with OCFS2 support, as the advisory does not list specific kernel versions.

Risk and Exploitability

The advisory does not provide an EPSS score and is not listed in the CISA KEV catalog. The flaw requires that an attacker be able to issue the OCFS2_IOC_GROUP_ADD ioctl, which typically means local access or privileged user capability. Once the ioctl is executed, the kernel immediately panics, with no recovery path. The attack vector is straightforward for a local user with sufficient rights, and the impact is a complete system crash with possible data loss, but there is no direct privilege escalation beyond the privileges required to run the ioctl.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< f7e139d7563f6947ad509fb468903941d0bb7ddd
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< 22544ddedf381ed5191cfc783aea8d6c936bc201
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< 76bd722db0a92b84ccd99e03796a0b6f1ae71c31
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< b9ae3942deec4c9e3fa2070521f90910f7490011
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< e7c2cb552e6eb85c0f5aefdd7f0f7c3c8591a6a3
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< aed87e866d1a321edb9703563c2faa8fec89835d
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< 6c5e70409c1961fe1278968f038eaaed6cc1145a
`7909f2bf835376a20d6dbf853eb459a27566eba2`	affected	< 70b672833f4025341c11b22c7f83778a5cd611bc

Linux

affected

Version	Status	Constraints
`2.6.25`	affected	—
`0`	unaffected	< 2.6.25
`5.10.258`	unaffected	≤ 5.10.*
`5.15.209`	unaffected	≤ 5.15.*
`6.1.175`	unaffected	≤ 6.1.*
`6.6.141`	unaffected	≤ 6.6.*
`6.12.91`	unaffected	≤ 6.12.*
`6.18.33`	unaffected	≤ 6.18.*
`7.0.10`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[7909f2bf835376a20d6dbf853eb459a27566eba2,f7e139d7563f6947ad509fb468903941d0bb7ddd)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,22544ddedf381ed5191cfc783aea8d6c936bc201)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,76bd722db0a92b84ccd99e03796a0b6f1ae71c31)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,b9ae3942deec4c9e3fa2070521f90910f7490011)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,e7c2cb552e6eb85c0f5aefdd7f0f7c3c8591a6a3)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,aed87e866d1a321edb9703563c2faa8fec89835d)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,6c5e70409c1961fe1278968f038eaaed6cc1145a)`	affected	code_commit	—
`[7909f2bf835376a20d6dbf853eb459a27566eba2,70b672833f4025341c11b22c7f83778a5cd611bc)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.25`	affected	semver	—
`[0,2.6.25)`	unaffected	semver	—
`[5.10.258,5.11.0)`	unaffected	semver	—
`[5.15.209,5.16.0)`	unaffected	semver	—
`[6.1.175,6.2.0)`	unaffected	semver	—
`[6.6.141,6.7.0)`	unaffected	semver	—
`[6.12.91,6.13.0)`	unaffected	semver	—
`[6.18.33,6.19.0)`	unaffected	semver	—
`[7.0.10,7.1.0)`	unaffected	semver	—
`[7.1,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Update the Linux kernel to a release that contains the OCFS2 ioctl validation patch.
Restrict write and ioctl access to the OCFS2 device files so that only trusted, privileged users can issue the group‑add ioctl, using file ACLs, SELinux or AppArmor.
Monitor kernel logs (e.g., /var/log/kern.log, dmesg) and system uptime, and configure automated alerts for kernel crashes to enable rapid reboot or failover.

Generated by OpenCVE AI on June 24, 2026 at 20:12 UTC.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00176.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/22544ddedf381ed5191cfc783aea8d6c936bc201
https://git.kernel.org/stable/c/6c5e70409c1961fe1278968f038eaaed6cc1145a
https://git.kernel.org/stable/c/70b672833f4025341c11b22c7f83778a5cd611bc
https://git.kernel.org/stable/c/76bd722db0a92b84ccd99e03796a0b6f1ae71c31
https://git.kernel.org/stable/c/aed87e866d1a321edb9703563c2faa8fec89835d
https://git.kernel.org/stable/c/b9ae3942deec4c9e3fa2070521f90910f7490011
https://git.kernel.org/stable/c/e7c2cb552e6eb85c0f5aefdd7f0f7c3c8591a6a3
https://git.kernel.org/stable/c/f7e139d7563f6947ad509fb468903941d0bb7ddd

History

Wed, 24 Jun 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate group add input before caching [BUG] OCFS2_IOC_GROUP_ADD can trigger a BUG_ON in ocfs2_set_new_buffer_uptodate(): kernel BUG at fs/ocfs2/uptodate.c:509! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:ocfs2_set_new_buffer_uptodate+0x194/0x1e0 fs/ocfs2/uptodate.c:509 Code: ffffe88f 42b9fe4c 89e64889 dfe8b4df Call Trace: ocfs2_group_add+0x3f1/0x1510 fs/ocfs2/resize.c:507 ocfs2_ioctl+0x309/0x6e0 fs/ocfs2/ioctl.c:887 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 RIP: 0033:0x7bbfb55a966d [CAUSE] ocfs2_group_add() calls ocfs2_set_new_buffer_uptodate() on a user-controlled group block before ocfs2_verify_group_and_input() validates that block number. That helper is only valid for newly allocated metadata and asserts that the block is not already present in the chosen metadata cache. The code also uses INODE_CACHE(inode) even though the group descriptor belongs to main_bm_inode and later journal accesses use that cache context instead. [FIX] Validate the on-disk group descriptor before caching it, then add it to the metadata cache tracked by INODE_CACHE(main_bm_inode). Keep the validation failure path separate from the later cleanup path so we only remove the buffer from that cache after it has actually been inserted. This keeps the group buffer lifetime consistent across validation, journaling, and cleanup.
Title		ocfs2: validate group add input before caching
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/22544ddedf381ed5191cfc783aea8d6c936bc201 https://git.kernel.org/stable/c/6c5e70409c1961fe1278968f038eaaed6cc1145a https://git.kernel.org/stable/c/70b672833f4025341c11b22c7f83778a5cd611bc https://git.kernel.org/stable/c/76bd722db0a92b84ccd99e03796a0b6f1ae71c31 https://git.kernel.org/stable/c/aed87e866d1a321edb9703563c2faa8fec89835d https://git.kernel.org/stable/c/b9ae3942deec4c9e3fa2070521f90910f7490011 https://git.kernel.org/stable/c/e7c2cb552e6eb85c0f5aefdd7f0f7c3c8591a6a3 https://git.kernel.org/stable/c/f7e139d7563f6947ad509fb468903941d0bb7ddd

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-24T16:29:45.853Z

Updated: 2026-06-24T16:29:45.853Z

Reserved: 2026-06-09T07:44:35.380Z

Link: CVE-2026-53039

Vulnrichment

No data.

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-06-24T23:45:02Z

Weaknesses

No weakness.

Impact

Affected Systems

Risk and Exploitability

Tracking

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