CVE-2023-53136
af_unix: fix struct pid leaks in OOB support
- Published
- Updated
- Reserved
- Assigned by
- Linux
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
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
- affected 314001f0bf927015e459c9d387d62a231fe93af3 – < f3969427fb06a2c3cd6efd7faab63505cfa76e76
- affected 314001f0bf927015e459c9d387d62a231fe93af3 – < ac1968ac399205fda9ee3b18f7de7416cb3a5d0d
- affected 314001f0bf927015e459c9d387d62a231fe93af3 – < a59d6306263c38e5c0592ea4451ca26a0778c947
- affected 314001f0bf927015e459c9d387d62a231fe93af3 – < 2aab4b96900272885bc157f8b236abf1cdc02e08
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.103 – ≤ 5.15.*
- unaffected 6.1.20 – ≤ 6.1.*
- unaffected 6.2.7 – ≤ 6.2.*
- unaffected 6.3 – ≤ *
References (4)
- https://git.kernel.org/stable/c/f3969427fb06a2c3cd6efd7faab63505cfa76e76 (opens in a new tab)
- https://git.kernel.org/stable/c/ac1968ac399205fda9ee3b18f7de7416cb3a5d0d (opens in a new tab)
- https://git.kernel.org/stable/c/a59d6306263c38e5c0592ea4451ca26a0778c947 (opens in a new tab)
- https://git.kernel.org/stable/c/2aab4b96900272885bc157f8b236abf1cdc02e08 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-53136)Record last updated .