CVE-2026-23304

MEDIUM EPSS 2.4%
Published Mar 25, 20263mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Mar 25, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu() l3mdev_master_dev_rcu() can return NULL when the slave device is being un-slaved from a VRF. All other callers deal with this, but we lost the fallback to loopback in ip6_rt_pcpu_alloc() -> ip6_rt_get_dev_rcu() with commit 4832c30d5458 ("net: ipv6: put host and anycast routes on device with address"). KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] RIP: 0010:ip6_rt_pcpu_alloc (net/ipv6/route.c:1418) Call Trace: ip6_pol_route (net/ipv6/route.c:2318) fib6_rule_lookup (net/ipv6/fib6_rules.c:115) ip6_route_output_flags (net/ipv6/route.c:2607) vrf_process_v6_outbound (drivers/net/vrf.c:437) I was tempted to rework the un-slaving code to clear the flag first and insert synchronize_rcu() before we remove the upper. But looks like the explicit fallback to loopback_dev is an established pattern. And I guess avoiding the synchronize_rcu() is nice, too.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥4.14  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.167
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.77
linuxlinux_kernel*≥6.13  –  <6.18.17
linuxlinux_kernel*≥6.19  –  <6.19.7
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a73fe9f4ae84a239d5b2686f47a58c158aee2eb4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d542e2ac7f9e288d49735be0775611547ca4e0ee
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a73fe9f4ae84a239d5b2686f47a58c158aee2eb4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d542e2ac7f9e288d49735be0775611547ca4e0ee
    Patch