# CVE-2024-36972: linux: In the Linux kernel, the following vulnerability has been resolved:  af_unix: Update unix_sk(sk)->oob_skb under sk_re...

CVE-2024-36972 is fixed in 44 products on 1 platform, first by DEBIAN-CVE-2024-36972, released June 10, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-36972
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0052
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 10, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  af_unix: Update unix_sk(sk)->oob_skb under sk_receive_queue lock.  Billy Jheng Bing-Jhong reported a race between __unix_gc() and queue_oob().  __unix_gc() tries to garbage-collect close()d inflight sockets, and then if the socket has MSG_OOB in unix_sk(sk)->oob_skb, GC will drop the reference and set NULL to it locklessly.  However, the peer socket still can send MSG_OOB message and queue_oob() can update unix_sk(sk)->oob_skb concurrently, leading NULL pointer dereference. [0]  To fix the issue, let's update unix_sk(sk)->oob_skb under the sk_receive_queue's lock and take it everywhere we touch oob_skb.  Note that we defer kfree_skb() in manage_oob() to silence lockdep false-positive (See [1]).  [0]: BUG: kernel NULL pointer dereference, address: 0000000000000008  PF: supervisor write access in kernel mode  PF: error_code(0x0002) - not-present page PGD 8000000009f5e067 P4D 8000000009f5e067 PUD 9f5d067 PMD 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 3 PID: 50 Comm: kworker/3:1 Not tainted 6.9.0-rc5-00191-gd091e579b864 #110 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Workqueue: events delayed_fput RIP: 0010:skb_dequeue (./include/linux/skbuff.h:2386 ./include/linux/skbuff.h:2402 net/core/skbuff.c:3847) Code: 39 e3 74 3e 8b 43 10 48 89 ef 83 e8 01 89 43 10 49 8b 44 24 08 49 c7 44 24 08 00 00 00 00 49 8b 14 24 49 c7 04 24 00 00 00 00 <48> 89 42 08 48 89 10 e8 e7 c5 42 00 4c 89 e0 5b 5d 41 5c c3 cc cc RSP: 0018:ffffc900001bfd48 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff8880088f5ae8 RCX: 00000000361289f9 RDX: 0000000000000000 RSI: 0000000000000206 RDI: ffff8880088f5b00 RBP: ffff8880088f5b00 R08: 0000000000080000 R09: 0000000000000001 R10: 0000000000000003 R11: 0000000000000001 R12: ffff8880056b6a00 R13: ffff8880088f5280 R14: 0000000000000001 R15: ffff8880088f5a80 FS:  0000000000000000(0000) GS:ffff88807dd80000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000006314000 CR4: 00000000007506f0 PKRU: 55555554 Call Trace:  <TASK>  unix_release_sock (net/unix/af_unix.c:654)  unix_release (net/unix/af_unix.c:1050)  __sock_release (net/socket.c:660)  sock_close (net/socket.c:1423)  __fput (fs/file_table.c:423)  delayed_fput (fs/file_table.c:444 (discriminator 3))  process_one_work (kernel/workqueue.c:3259)  worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416)  kthread (kernel/kthread.c:388)  ret_from_fork (arch/x86/kernel/process.c:153)  ret_from_fork_asm (arch/x86/entry/entry_64.S:257)  </TASK> Modules linked in: CR2: 0000000000000008

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | bpftool-debuginfo amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.14.1 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.14.1 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.14.1 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.8.2 | [SUSE-SU-2024:2896-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2896-1.md) | Aug 13, 2024 |
| Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.8.2 | [SUSE-SU-2024:2896-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2896-1.md) | Aug 13, 2024 |
| Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-debuginfo amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-default sles 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.14.2.150600.12.4.3 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.14.2.150600.12.4.3 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-devel amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-headers amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-libbpf amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-libbpf-devel amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-libbpf-static amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-livepatch-6.1.94-99.176 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_0 sles 15.6 | 20-150600.3.1 | [SUSE-SU-2025:02821-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02821-1.md) | Aug 16, 2025 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_1 sles 15.6 | 1-150600.1.5.1 | [SUSE-SU-2024:2973-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2973-1.md) | Aug 20, 2024 |
| Linux | kernel-livepatch-SLE15-SP6_Update_2 sles 15.6 | 1-150600.13.3.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-modules-extra amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-modules-extra-common amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.5.1 | [SUSE-SU-2024:2973-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2973-1.md) | Aug 20, 2024 |
| Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.5.1 | [SUSE-SU-2024:2973-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2973-1.md) | Aug 20, 2024 |
| Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-source sles 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.8.2 | [SUSE-SU-2024:2896-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2896-1.md) | Aug 13, 2024 |
| Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.8.2 | [SUSE-SU-2024:2896-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2896-1.md) | Aug 13, 2024 |
| Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.5.1 | [SUSE-SU-2024:2973-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2973-1.md) | Aug 20, 2024 |
| Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.8.1 | [SUSE-SU-2024:2896-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2896-1.md) | Aug 13, 2024 |
| Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.8.1 | [SUSE-SU-2024:2896-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2896-1.md) | Aug 13, 2024 |
| Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.5.1 | [SUSE-SU-2024:2973-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2973-1.md) | Aug 20, 2024 |
| Linux | kernel-tools amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-tools-debuginfo amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-tools-devel amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.14.2 | [SUSE-SU-2024:2571-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2571-1.md) | Jul 22, 2024 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.94-1 | [DEBIAN-CVE-2024-36972](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36972.md) | Jun 10, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-36972](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36972.md) | Jun 10, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-36972](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36972.md) | Jun 10, 2024 |
| Linux | perf amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | perf-debuginfo amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | python3-perf amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |
| Linux | python3-perf-debuginfo amzn 2023 | 6.1.94-99.176.amzn2023 | [ALAS2023-2024-683](https://patchblox.com/security/data/fix/linux/alas2023-2024-683.md) | Aug 1, 2024 |

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