Medium 5.5Published Jun 24, 2026

CVE-2026-53039ocfs2: validate group add input before caching

Updated under an hour ago (Oct 28, 2026, 11:40 AM ET)

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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.

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: Analyzed
Record last updated: Jun 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7909f2bf835376a20d6dbf853eb459a27566eba2 before f7e139d7563f6947ad509fb468903941d0bb7ddd; from 7909f2bf835376a20d6dbf853eb459a27566eba2 before 22544ddedf381ed5191cfc783aea8d6c936bc201; 7909f2bf835376a20d6dbf853eb459a27566eba2 builds before 76bd722db0a92b84ccd99e03796a0b6f1ae71c31; from 7909f2bf835376a20d6dbf853eb459a27566eba2 before b9ae3942deec4c9e3fa2070521f90910f7490011; from 7909f2bf835376a20d6dbf853eb459a27566eba2 before e7c2cb552e6eb85c0f5aefdd7f0f7c3c8591a6a3; from 7909f2bf835376a20d6dbf853eb459a27566eba2 before aed87e866d1a321edb9703563c2faa8fec89835d; 7909f2bf835376a20d6dbf853eb459a27566eba2 builds before 6c5e70409c1961fe1278968f038eaaed6cc1145a; 7909f2bf835376a20d6dbf853eb459a27566eba2 builds before 70b672833f4025341c11b22c7f83778a5cd611bc	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.25 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10	NVD

References

References

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