EUVD-2026-39305
GHSA-5r3h-v82j-r7rr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local attack vector and low privileges (CAP_NET_ADMIN) required; pure DoS with no confidentiality or integrity impact from a kernel null-ptr-deref.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
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:
- addrconf_prefix_rcv(): Requests a route with the 'RTF_ADDRCONF |
RTF_PREFIX_RT' flags which are not set on fib6_null_entry.
- modify_prefix_route(): Fixed by commit a747e02430df ("ipv6: avoid
possible NULL deref in modify_prefix_route()").
- __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)
AnalysisAI
Null pointer dereference in the Linux kernel's IPv6 address configuration subsystem crashes the kernel when cleanup_prefix_route() receives the fib6_null_entry sentinel from addrconf_get_prefix_route() and attempts to access its NULL fib6_table pointer without validation. An authenticated local user holding CAP_NET_ADMIN can trigger this by sending a crafted IPv6 DELADDR netlink message, causing a general protection fault and system-wide denial of service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local process with CAP_NET_ADMIN capability (or equivalent access in a network namespace, which is automatically granted to processes in a new user+network namespace on many Linux distributions). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (score 5.5 Medium) accurately reflects real-world risk: exploitation requires local presence and at minimum CAP_NET_ADMIN, which is a meaningful barrier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local user or process holding CAP_NET_ADMIN (for example, a containerised workload granted NET_ADMIN capability) constructs and transmits a DELADDR rtnetlink message requesting deletion of an IPv6 address whose corresponding prefix route resolves to the fib6_null_entry sentinel. The kernel's cleanup_prefix_route() dereferences the sentinel's NULL fib6_table pointer while attempting to acquire the table's spinlock, triggering a general protection fault detected by KASAN and causing an immediate kernel panic, crashing the entire host. … |
| Remediation | The primary fix is to upgrade to a patched Linux kernel version: 6.6.143, 6.12.94, 6.18.36, 7.0.13, or 7.1 (stable). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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