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🛡️ CVE-2023-52599 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

jfs: fix array-index-out-of-bounds in diNewExt

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

jfs: fix array-index-out-of-bounds in diNewExt

[Syz report]

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:2360:2

index -878706688 is out of range for type 'struct iagctl[128]'

CPU: 1 PID: 5065 Comm: syz-executor282 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:88 [inline]

dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106

ubsan_epilogue lib/ubsan.c:217 [inline]

__ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348

diNewExt+0x3cf3/0x4000 fs/jfs/jfs_imap.c:2360

diAllocExt fs/jfs/jfs_imap.c:1949 [inline]

diAllocAG+0xbe8/0x1e50 fs/jfs/jfs_imap.c:1666

diAlloc+0x1d3/0x1760 fs/jfs/jfs_imap.c:1587

ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56

jfs_mkdir+0x1c5/0xb90 fs/jfs/namei.c:225

vfs_mkdir+0x2f1/0x4b0 fs/namei.c:4106

do_mkdirat+0x264/0x3a0 fs/namei.c:4129

__do_sys_mkdir fs/namei.c:4149 [inline]

__se_sys_mkdir fs/namei.c:4147 [inline]

__x64_sys_mkdir+0x6e/0x80 fs/namei.c:4147

do_syscall_x64 arch/x86/entry/common.c:51 [inline]

do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82

entry_SYSCALL_64_after_hwframe+0x63/0x6b

RIP: 0033:0x7fcb7e6a0b57

Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007ffd83023038 EFLAGS: 00000286 ORIG_RAX: 0000000000000053

RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fcb7e6a0b57

RDX: 00000000000a1020 RSI: 00000000000001ff RDI: 0000000020000140

RBP: 0000000020000140 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000286 R12: 00007ffd830230d0

R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

[Analysis]

When the agstart is too large, it can cause agno overflow.

[Fix]

After obtaining agno, if the value is invalid, exit the subsequent process.

Modified the test from agno > MAXAG to agno >= MAXAG based on linux-next

report by kernel test robot (Dan Carpenter).

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 high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-52599 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.7.4)
  • linux-kernel (from 6.7 up to 6.7.4)

Timeline and source

Published on 6 March 2024 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)
lists.debian.org (Web)
lists.debian.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-52599 on other distributions

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

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-03-06
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.7.4
linux-kernel 6.7 6.7.4

References

Similar Threats

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