---
id: CVE-2026-53214
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: Fix a potential NPD in cleanup_prefix_route()

  addrconf_get_prefix_route() can return the fib6_null_entry sentinel
  entry which has a NULL fib6_table pointer
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: Fix a potential NPD in cleanup_prefix_route()

  addrconf_get_prefix_route() can return the fib6_null_entry sentinel
  entry which has a NULL fib6_table pointer. Ther…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.6.120, < 6.6.143'
  - 'linux_kernel >= 6.9, < 6.12.94'
  - 'linux_kernel >= 6.13, < 6.18.36'
  - 'linux_kernel >= 6.19, < 7.0.13'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.13
published: '2026-06-25'
updated: '2026-07-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53214'
references:
  - url: 'https://git.kernel.org/stable/c/07d9a0870a178843cea44cfd58c27445dc94cf5f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/192df376a05c2db15564640f9da7e20907c1fa24'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f82b02b4059ddc06e4fcfd057bfb59fd6885cd2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/653a2849305708f75260b5296f17b2a759ff9cc7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b70c687b7cf267fb08586667a3946c8851cad672'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00122
epssPercentile: 0.01727
ingestedAt: '2026-07-03T13:02:28.044Z'
---

## Overview

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

ipv6: Fix a potential NPD in cleanup_prefix_route()

addrconf_get_prefix_route() can return the fib6_null_entry sentinel
entry which has a NULL fib6_table pointer. Therefore, before setting the
route's expiration time, check that we are not working with this entry,
as otherwise a NPD will be triggered [1].

Note that the other callers of addrconf_get_prefix_route() are not
susceptible to this bug:

1. addrconf_prefix_rcv(): Requests a route with the 'RTF_ADDRCONF |
   RTF_PREFIX_RT' flags which are not set on fib6_null_entry.

2. modify_prefix_route(): Fixed by commit a747e02430df ("ipv6: avoid
   possible NULL deref in modify_prefix_route()").

3. __ipv6_ifa_notify(): Calls ip6_del_rt() which specifically checks for
   fib6_null_entry and returns an error.

[1]
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[...]
Call Trace:
<TASK>
__kasan_check_byte (mm/kasan/common.c:573)
lock_acquire.part.0 (kernel/locking/lockdep.c:5842 (discriminator 1))
_raw_spin_lock_bh (kernel/locking/spinlock.c:182 (discriminator 1))
cleanup_prefix_route (net/ipv6/addrconf.c:1280)
ipv6_del_addr (net/ipv6/addrconf.c:1342)
inet6_addr_del.isra.0 (net/ipv6/addrconf.c:3119)
inet6_rtm_deladdr (net/ipv6/addrconf.c:4812)
rtnetlink_rcv_msg (net/core/rtnetlink.c:6997)
netlink_rcv_skb (net/netlink/af_netlink.c:2555)
netlink_unicast (net/netlink/af_netlink.c:1344)
netlink_sendmsg (net/netlink/af_netlink.c:1899)
__sock_sendmsg (net/socket.c:802 (discriminator 4))
____sys_sendmsg (net/socket.c:2698)
___sys_sendmsg (net/socket.c:2752)
__sys_sendmsg (net/socket.c:2784)
do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)

## Affected

- `linux_kernel >= 6.6.120, < 6.6.143`
- `linux_kernel >= 6.9, < 6.12.94`
- `linux_kernel >= 6.13, < 6.18.36`
- `linux_kernel >= 6.19, < 7.0.13`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.13`