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Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102134)
medium Nessus Plugin ID 337265
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-2026-102134 advisory.In the Linux kernel, the following vulnerability has been resolved:
ip6_gre: make ip6gre_header() robust
Over the years, syzbot found many ways to crash the kernel in ip6gre_header() [1].
This involves team or bonding drivers ability to dynamically change their dev->needed_headroom and/or dev->hard_header_len
In this particular crash mld_newpack() allocated an skb with a too small reserve/headroom, and by the time mld_sendpack() was called, syzbot managed to attach an ip6gre device.
[1] skbuff: skb_under_panic: text:ffffffff8a1d69a8 len:136 put:40 head:ffff888059bc7000 data:ffff888059bc6fe8 tail:0x70 end:0x6c0 dev:team0
------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:213 ! <TASK> skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ip6gre_header+0xc8/0x790 net/ipv6/ip6_gre.c:1371 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136
__ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:220 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318 mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693
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
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://nvd.nist.gov/vuln/detail/CVE-2025-71098
https://security-tracker.debian.org/tracker/CVE-2025-71098
http://www.nessus.org/u?4c583d32
http://www.nessus.org/u?538bd5c6
http://www.nessus.org/u?7364647f
http://www.nessus.org/u?79fe1cc8
http://www.nessus.org/u?a2a99188
http://www.nessus.org/u?b57e9054
http://www.nessus.org/u?d0069258
Plugin Details
Severity: Medium
ID: 337265
File Name: unity_linux_UTSA-2026-102134.nasl
Version: 1.1
Type: Local
Published: 8/18/2026
Updated: 8/18/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.7
Percentile: 96.73
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-2025-71098
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: 8/17/2026
Vulnerability Publication Date: 1/13/2026
Reference Information
CVE: CVE-2025-71098