CVE-2026-23304None▾ SunlitIn 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 dea…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < d542e2ac7f9e288d49735be0775611547ca4e0eeLinux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < a73fe9f4ae84a239d5b2686f47a58c158aee2eb4Linux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < 4a48fe59f29f673a3d042d679f26629a9c3e29d4Linux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < 581800298313c9fd75e94985e6d37d21b7e35d34Linux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < 3310fc11fc47387d1dd4759b0bc961643ea11c7fLinux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < 0b5a7826020706057cc5a9d9009e667027f221eeLinux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < ae88c8256547b63980770a9ea7be73a15900d27eLinux >= 4832c30d5458387ff2533ff66fbde26ad8bb5a2d < 2ffb4f5c2ccb2fa1c049dd11899aee7967deef5aLinux 4.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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