CVE-2023-53136

HIGH EPSS 4.7%
Published May 2, 20251y ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published May 2, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: af_unix: fix struct pid leaks in OOB support syzbot reported struct pid leak [1]. Issue is that queue_oob() calls maybe_add_creds() which potentially holds a reference on a pid. But skb->destructor is not set (either directly or by calling unix_scm_to_skb()) This means that subsequent kfree_skb() or consume_skb() would leak this reference. In this fix, I chose to fully support scm even for the OOB message. [1] BUG: memory leak unreferenced object 0xffff8881053e7f80 (size 128): comm "syz-executor242", pid 5066, jiffies 4294946079 (age 13.220s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff812ae26a>] alloc_pid+0x6a/0x560 kernel/pid.c:180 [<ffffffff812718df>] copy_process+0x169f/0x26c0 kernel/fork.c:2285 [<ffffffff81272b37>] kernel_clone+0xf7/0x610 kernel/fork.c:2684 [<ffffffff812730cc>] __do_sys_clone+0x7c/0xb0 kernel/fork.c:2825 [<ffffffff849ad699>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff849ad699>] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 [<ffffffff84a0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.15  –  <5.15.103
linuxlinux_kernel*≥5.16  –  <6.1.20
linuxlinux_kernel*≥6.2  –  <6.2.7
linuxlinux_kernel6.3any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/2aab4b96900272885bc157f8b236abf1cdc02e08
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a59d6306263c38e5c0592ea4451ca26a0778c947
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ac1968ac399205fda9ee3b18f7de7416cb3a5d0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f3969427fb06a2c3cd6efd7faab63505cfa76e76
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2aab4b96900272885bc157f8b236abf1cdc02e08
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a59d6306263c38e5c0592ea4451ca26a0778c947
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ac1968ac399205fda9ee3b18f7de7416cb3a5d0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f3969427fb06a2c3cd6efd7faab63505cfa76e76
    Patch