Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic [1] [2]. (CVE-2026-53012)
In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic [1] [2]. When an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag of all groups containing this nexthop is not updated. This is because nh_group_v4_update is only called when replacing AF_INET to AF_INET6, but the reverse direction (AF_INET6 to AF_INET) is missed. This allows a stale has_v4=false to bypass fib6_check_nexthop, causing IPv6 routes to be attached to groups that effectively contain only AF_INET members. Subsequent route lookups then call nexthop_fib6_nh() which returns NULL for the AF_INET member, leading to a NULL pointer dereference. Fix by calling nh_group_v4_update whenever the family changes, not just AF_INET to AF_INET6. Reproducer: # AF_INET6 blackhole ip -6 nexthop add id 1 blackhole # group with has_v4=false ip nexthop add id 100 group 1 # replace with AF_INET (no -6), has_v4 stays false ip nexthop replace id 1 blackhole # pass stale has_v4 check ip -6 route add 2001:db8::/64 nhid 100 # panic ping -6 2001:db8::1 [1] https://syzkaller.appspot.com/bug?id=e17283eb2f8dcf3dd9b47fe6f67a95f71faadad0 [2] https://syzkaller.appspot.com/bug?id=8699b6ae54c9f35837d925686208402949e12ef3
AI Analysis
Technical Summary
The Linux kernel vulnerability involves improper handling of the has_v4 flag in nexthop groups when replacing an IPv6 nexthop with an IPv4 nexthop. The function nh_group_v4_update is only called when replacing AF_INET with AF_INET6, but not in the reverse direction. This leads to stale has_v4=false flags that bypass fib6_check_nexthop, causing IPv6 routes to be attached to groups containing only AF_INET members. Subsequent route lookups invoke nexthop_fib6_nh(), which returns NULL for the AF_INET member, resulting in a NULL pointer dereference and kernel panic. The fix calls nh_group_v4_update whenever the address family changes, preventing stale state and crashes.
Potential Impact
The vulnerability causes a denial of service via kernel panic due to NULL pointer dereference when certain IPv6 routing operations are performed. There is no confidentiality or integrity impact reported. Exploitation requires local privileges with the ability to manipulate nexthop routing entries. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in updated Linux kernel versions that properly update the has_v4 flag on address family changes in nexthop groups. Users should upgrade to kernel versions 5.15.0-1112.119~20.04.1 or later, 5.15.0-1117.126~20.04.1 or later, 5.15.0-1117.126~20.04.2 or later, 5.15.0-186.196~20.04.1 or later, and 5.15.0-1106.110~20.04.1 or later as applicable. Patch status is confirmed by the presence of fixed versions. No additional mitigation is indicated.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic [1] [2]. (CVE-2026-53012)
Description
In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic [1] [2]. When an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag of all groups containing this nexthop is not updated. This is because nh_group_v4_update is only called when replacing AF_INET to AF_INET6, but the reverse direction (AF_INET6 to AF_INET) is missed. This allows a stale has_v4=false to bypass fib6_check_nexthop, causing IPv6 routes to be attached to groups that effectively contain only AF_INET members. Subsequent route lookups then call nexthop_fib6_nh() which returns NULL for the AF_INET member, leading to a NULL pointer dereference. Fix by calling nh_group_v4_update whenever the family changes, not just AF_INET to AF_INET6. Reproducer: # AF_INET6 blackhole ip -6 nexthop add id 1 blackhole # group with has_v4=false ip nexthop add id 100 group 1 # replace with AF_INET (no -6), has_v4 stays false ip nexthop replace id 1 blackhole # pass stale has_v4 check ip -6 route add 2001:db8::/64 nhid 100 # panic ping -6 2001:db8::1 [1] https://syzkaller.appspot.com/bug?id=e17283eb2f8dcf3dd9b47fe6f67a95f71faadad0 [2] https://syzkaller.appspot.com/bug?id=8699b6ae54c9f35837d925686208402949e12ef3
CVSS v3.1
Score 5.5medium
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email 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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=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability involves improper handling of the has_v4 flag in nexthop groups when replacing an IPv6 nexthop with an IPv4 nexthop. The function nh_group_v4_update is only called when replacing AF_INET with AF_INET6, but not in the reverse direction. This leads to stale has_v4=false flags that bypass fib6_check_nexthop, causing IPv6 routes to be attached to groups containing only AF_INET members. Subsequent route lookups invoke nexthop_fib6_nh(), which returns NULL for the AF_INET member, resulting in a NULL pointer dereference and kernel panic. The fix calls nh_group_v4_update whenever the address family changes, preventing stale state and crashes.
Potential Impact
The vulnerability causes a denial of service via kernel panic due to NULL pointer dereference when certain IPv6 routing operations are performed. There is no confidentiality or integrity impact reported. Exploitation requires local privileges with the ability to manipulate nexthop routing entries. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in updated Linux kernel versions that properly update the has_v4 flag on address family changes in nexthop groups. Users should upgrade to kernel versions 5.15.0-1112.119~20.04.1 or later, 5.15.0-1117.126~20.04.1 or later, 5.15.0-1117.126~20.04.2 or later, 5.15.0-186.196~20.04.1 or later, and 5.15.0-1106.110~20.04.1 or later as applicable. Patch status is confirmed by the presence of fixed versions. No additional mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53012
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro: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: 6a58b48168715ace43d9eff8
Added to database: 07/16/2026, 10:37:53 UTC
Last enriched: 07/30/2026, 22:08:05 UTC
Last updated: 07/31/2026, 19:30:19 UTC
Views: 2
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