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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-990851)

medium Nessus Plugin ID 275075

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-990851 advisory.

 In the Linux kernel, the following vulnerability has been resolved:

 af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg

 A data-race condition has been identified in af_unix. In one data path, the write function unix_release_sock() atomically writes to sk->sk_shutdown using WRITE_ONCE. However, on the reader side, unix_stream_sendmsg() does not read it atomically. Consequently, this issue is causing the following KCSAN splat to occur:

 BUG: KCSAN: data-race in unix_release_sock / unix_stream_sendmsg

 write (marked) to 0xffff88867256ddbb of 1 bytes by task 7270 on cpu 28:
 unix_release_sock (net/unix/af_unix.c:640) unix_release (net/unix/af_unix.c:1050) sock_close (net/socket.c:659 net/socket.c:1421)
 __fput (fs/file_table.c:422)
 __fput_sync (fs/file_table.c:508)
 __se_sys_close (fs/open.c:1559 fs/open.c:1541)
 __x64_sys_close (fs/open.c:1541) x64_sys_call (arch/x86/entry/syscall_64.c:33) do_syscall_64 (arch/x86/entry/common.c:?) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)

 read to 0xffff88867256ddbb of 1 bytes by task 989 on cpu 14:
 unix_stream_sendmsg (net/unix/af_unix.c:2273)
 __sock_sendmsg (net/socket.c:730 net/socket.c:745)
 ____sys_sendmsg (net/socket.c:2584)
 __sys_sendmmsg (net/socket.c:2638 net/socket.c:2724)
 __x64_sys_sendmmsg (net/socket.c:2753 net/socket.c:2750 net/socket.c:2750) x64_sys_call (arch/x86/entry/syscall_64.c:33) do_syscall_64 (arch/x86/entry/common.c:?) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)

 value changed: 0x01 -> 0x03

 The line numbers are related to commit dd5a440a31fa (Linux 6.9-rc7).

 Commit e1d09c2c2f57 (af_unix: Fix data races around sk->sk_shutdown.) addressed a comparable issue in the past regarding sk->sk_shutdown.
 However, it overlooked resolving this particular data path.
 This patch only offending unix_stream_sendmsg() function, since the other reads seem to be protected by unix_state_lock() as discussed in

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

http://www.nessus.org/u?8b4c9957

http://www.nessus.org/u?041d8929

https://nvd.nist.gov/vuln/detail/CVE-2024-38596

Plugin Details

Severity: Medium

ID: 275075

File Name: unity_linux_UTSA-2025-990851.nasl

Version: 1.1

Type: local

Published: 11/12/2025

Updated: 11/12/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.1

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2024-38596

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2025

Vulnerability Publication Date: 12/12/2023

Reference Information

CVE: CVE-2024-38596