CVE-2025-37741

MEDIUM EPSS 2.5%
Published May 1, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
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Published May 1, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: jfs: Prevent copying of nlink with value 0 from disk inode syzbot report a deadlock in diFree. [1] When calling "ioctl$LOOP_SET_STATUS64", the offset value passed in is 4, which does not match the mounted loop device, causing the mapping of the mounted loop device to be invalidated. When creating the directory and creating the inode of iag in diReadSpecial(), read the page of fixed disk inode (AIT) in raw mode in read_metapage(), the metapage data it returns is corrupted, which causes the nlink value of 0 to be assigned to the iag inode when executing copy_from_dinode(), which ultimately causes a deadlock when entering diFree(). To avoid this, first check the nlink value of dinode before setting iag inode. [1] WARNING: possible recursive locking detected 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Not tainted -------------------------------------------- syz-executor301/5309 is trying to acquire lock: ffff888044548920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 but task is already holding lock: ffff888044548920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(imap->im_aglock[index])); lock(&(imap->im_aglock[index])); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz-executor301/5309: #0: ffff8880422a4420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88804755b390 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline] #1: ffff88804755b390 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026 #2: ffff888044548920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630 #3: ffff888044548890 (&imap->im_freelock){+.+.}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2460 [inline] #3: ffff888044548890 (&imap->im_freelock){+.+.}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #3: ffff888044548890 (&imap->im_freelock){+.+.}-{3:3}, at: diAllocAG+0x4b7/0x1e50 fs/jfs/jfs_imap.c:1669 #4: ffff88804755a618 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline] #4: ffff88804755a618 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #4: ffff88804755a618 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diAllocAG+0x869/0x1e50 fs/jfs/jfs_imap.c:1669 stack backtrace: CPU: 0 UID: 0 PID: 5309 Comm: syz-executor301 Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037 check_deadlock kernel/locking/lockdep.c:3089 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156 evict+0x4e8/0x9b0 fs/inode.c:725 diFreeSpecial fs/jfs/jfs_imap.c:552 [inline] duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3022 diNewIAG fs/jfs/jfs_imap.c:2597 [inline] diAllocExt fs/jfs/jfs_imap.c:1905 [inline] diAllocAG+0x17dc/0x1e50 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/en ---truncated---

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel* <5.4.293
linuxlinux_kernel*≥5.5  –  <5.10.237
linuxlinux_kernel*≥5.11  –  <5.15.181
linuxlinux_kernel*≥5.16  –  <6.1.135
linuxlinux_kernel*≥6.2  –  <6.6.88
linuxlinux_kernel*≥6.7  –  <6.12.24
linuxlinux_kernel*≥6.13  –  <6.13.12
linuxlinux_kernel*≥6.14  –  <6.14.3
debiandebian_linux11.0any

References 11

  • git.kernel.org https://git.kernel.org/stable/c/5b2f26d3fba4e9aac314f8bc0963b3fc28c0e456
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/86bfeaa18f9e4615b97f2d613e0fcc4ced196527
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b5ce75f8bd3ddf480cc0a240d7ff5cdea0444f9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/994787341358816d91b2fded288ecb7f129f2b27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a2b560815528ae8e266fca6038bb5585d13aaef4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aeb926e605f97857504bdf748f575e40617e2ef9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3c4884b987e5d8d0ec061a4d52653c4f4b9c37e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b61e69bb1c049cf507e3c654fa3dc1568231bd07
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c9541c2bd0edbdbc5c1148a84d3b48dc8d1b8af2
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
    Mailing List
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
    Mailing List

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/5b2f26d3fba4e9aac314f8bc0963b3fc28c0e456
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/86bfeaa18f9e4615b97f2d613e0fcc4ced196527
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b5ce75f8bd3ddf480cc0a240d7ff5cdea0444f9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/994787341358816d91b2fded288ecb7f129f2b27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a2b560815528ae8e266fca6038bb5585d13aaef4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aeb926e605f97857504bdf748f575e40617e2ef9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3c4884b987e5d8d0ec061a4d52653c4f4b9c37e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b61e69bb1c049cf507e3c654fa3dc1568231bd07
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c9541c2bd0edbdbc5c1148a84d3b48dc8d1b8af2
    Patch