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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986785)

medium Nessus Plugin ID 268600

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-2025-986785 advisory.

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

 net: tun: Fix memory leaks of napi_get_frags

 kmemleak reports after running test_progs:

 unreferenced object 0xffff8881b1672dc0 (size 232):
 comm test_progs, pid 394388, jiffies 4354712116 (age 841.975s) hex dump (first 32 bytes):
 e0 84 d7 a8 81 88 ff ff 80 2c 67 b1 81 88 ff ff .........,g.....
 00 40 c5 9b 81 88 ff ff 00 00 00 00 00 00 00 00 .@..............
 backtrace:
 [<00000000c8f01748>] napi_skb_cache_get+0xd4/0x150 [<0000000041c7fc09>] __napi_build_skb+0x15/0x50 [<00000000431c7079>] __napi_alloc_skb+0x26e/0x540 [<000000003ecfa30e>] napi_get_frags+0x59/0x140 [<0000000099b2199e>] tun_get_user+0x183d/0x3bb0 [tun] [<000000008a5adef0>] tun_chr_write_iter+0xc0/0x1b1 [tun] [<0000000049993ff4>] do_iter_readv_writev+0x19f/0x320 [<000000008f338ea2>] do_iter_write+0x135/0x630 [<000000008a3377a4>] vfs_writev+0x12e/0x440 [<00000000a6b5639a>] do_writev+0x104/0x280 [<00000000ccf065d8>] do_syscall_64+0x3b/0x90 [<00000000d776e329>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

 The issue occurs in the following scenarios:
 tun_get_user() napi_gro_frags() napi_frags_finish() case GRO_NORMAL:
 gro_normal_one() list_add_tail(&skb->list, &napi->rx_list);
 <-- While napi->rx_count < READ_ONCE(gro_normal_batch), <-- gro_normal_list() is not called, napi->rx_list is not empty <-- not ask to complete the gro work, will cause memory leaks in <-- following tun_napi_del() ...
 tun_napi_del() netif_napi_del()
 __netif_napi_del() <-- &napi->rx_list is not empty, which caused memory leaks

 To fix, add napi_complete() after napi_gro_frags().

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?bd78c984

http://www.nessus.org/u?8add6620

https://nvd.nist.gov/vuln/detail/CVE-2022-49871

Plugin Details

Severity: Medium

ID: 268600

File Name: unity_linux_UTSA-2025-986785.nasl

Version: 1.2

Type: local

Published: 10/7/2025

Updated: 10/15/2025

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-2022-49871

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: 9/23/2025

Vulnerability Publication Date: 6/12/2024

Reference Information

CVE: CVE-2022-49871