# CVE-2023-53136: linux: In the Linux kernel, the following vulnerability has been resolved: af_unix: fix struct pid leaks in OOB support sy... CVE-2023-53136 is fixed in 20 products on 1 platform, first by ALAS2023-2023-148, released March 30, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-53136 - Priority: High - CVSS: 7.1 (high) - EPSS: 0.0019 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Mar 30, 2023 ## 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: [] alloc_pid+0x6a/0x560 kernel/pid.c:180 [] copy_process+0x169f/0x26c0 kernel/fork.c:2285 [] kernel_clone+0xf7/0x610 kernel/fork.c:2684 [] __do_sys_clone+0x7c/0xb0 kernel/fork.c:2825 [] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 [] entry_SYSCALL_64_after_hwframe+0x63/0xcd ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-devel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-headers amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-libbpf amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-livepatch-6.1.21-1.45 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-tools amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-tools-devel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | linux Debian 12.15 (bookworm) | 6.1.20-1 | [DEBIAN-CVE-2023-53136](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53136.md) | May 2, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.1.20-1 | [DEBIAN-CVE-2023-53136](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53136.md) | May 2, 2025 | | Linux | linux Debian 14 | 6.1.20-1 | [DEBIAN-CVE-2023-53136](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53136.md) | May 2, 2025 | | Linux | perf amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | perf-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | python3-perf amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | --- Data as of 2026-11-08T00:53:09Z UTC. 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