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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987604)

medium Nessus Plugin ID 270955

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-2025-987604 advisory.

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

 watch_queue: Actually free the watch

 free_watch() does everything barring actually freeing the watch object. Fix this by adding the missing kfree.

 kmemleak produces a report something like the following. Note that as an address can be seen in the first word, the watch would appear to have gone through call_rcu().

 BUG: memory leak unreferenced object 0xffff88810ce4a200 (size 96):
 comm syz-executor352, pid 3605, jiffies 4294947473 (age 13.720s) hex dump (first 32 bytes):
 e0 82 48 0d 81 88 ff ff 00 00 00 00 00 00 00 00 ..H.............
 80 a2 e4 0c 81 88 ff ff 00 00 00 00 00 00 00 00 ................
 backtrace:
 [<ffffffff8214e6cc>] kmalloc include/linux/slab.h:581 [inline] [<ffffffff8214e6cc>] kzalloc include/linux/slab.h:714 [inline] [<ffffffff8214e6cc>] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800 [<ffffffff8214ec84>] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016 [<ffffffff84493a25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff84493a25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

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?1222d1bf

http://www.nessus.org/u?795d24bb

https://nvd.nist.gov/vuln/detail/CVE-2022-49256

Plugin Details

Severity: Medium

ID: 270955

File Name: unity_linux_UTSA-2025-987604.nasl

Version: 1.1

Type: local

Published: 10/21/2025

Updated: 10/21/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2022-49256

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/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: 10/15/2025

Vulnerability Publication Date: 7/19/2023

Reference Information

CVE: CVE-2022-49256