In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at… (CVE-2026-52915)
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh_mt6_check() does not reject larger optsnr values supplied from userspace. Validate optsnr in the rule setup path so only match data that fits the fixed-size opts array can be installed. This follows the existing xtables pattern of rejecting invalid user-provided counts in checkentry() and keeps the packet matching path unchanged. `struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array, where `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible: [ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29 [ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'
AI Analysis
Technical Summary
The Linux kernel netfilter ip6t_hbh module's struct ip6t_opts contains a fixed-size array opts with a maximum of 16 option descriptors (IP6T_OPTS_OPTSNR). However, the hbh_mt6_check() function did not reject larger optsnr values supplied from userspace, allowing an off-by-one array index out-of-bounds access at index 16. This vulnerability is addressed by validating the optsnr value during the rule setup path, ensuring only valid counts fitting the fixed-size array are accepted, following existing xtables validation patterns. This fix prevents potential memory corruption or denial of service caused by out-of-bounds access.
Potential Impact
Improper validation of the optsnr value can lead to an out-of-bounds array access in the kernel, potentially causing denial of service or other impacts related to memory corruption. The CVSS vector indicates local attack vector with low complexity and low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity impact, and high availability impact.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should upgrade to these or newer patched kernel versions to remediate this vulnerability. Since this is a kernel-level issue, applying the official kernel updates from the vendor is the recommended mitigation.
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at… (CVE-2026-52915)
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh_mt6_check() does not reject larger optsnr values supplied from userspace. Validate optsnr in the rule setup path so only match data that fits the fixed-size opts array can be installed. This follows the existing xtables pattern of rejecting invalid user-provided counts in checkentry() and keeps the packet matching path unchanged. `struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array, where `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible: [ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29 [ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'
CVSS v3.1
Score 7.1high
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel netfilter ip6t_hbh module's struct ip6t_opts contains a fixed-size array opts with a maximum of 16 option descriptors (IP6T_OPTS_OPTSNR). However, the hbh_mt6_check() function did not reject larger optsnr values supplied from userspace, allowing an off-by-one array index out-of-bounds access at index 16. This vulnerability is addressed by validating the optsnr value during the rule setup path, ensuring only valid counts fitting the fixed-size array are accepted, following existing xtables validation patterns. This fix prevents potential memory corruption or denial of service caused by out-of-bounds access.
Potential Impact
Improper validation of the optsnr value can lead to an out-of-bounds array access in the kernel, potentially causing denial of service or other impacts related to memory corruption. The CVSS vector indicates local attack vector with low complexity and low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity impact, and high availability impact.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should upgrade to these or newer patched kernel versions to remediate this vulnerability. Since this is a kernel-level issue, applying the official kernel updates from the vendor is the recommended mitigation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-52915
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a017e91ae9bcd3f8046f4
Added to database: 07/17/2026, 10:18:38 UTC
Last enriched: 07/30/2026, 15:22:07 UTC
Last updated: 07/31/2026, 19:30:20 UTC
Views: 1
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