CVE-2026-23304
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | d542e2ac7f9e288d49735be0775611547ca4e0ee | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | a73fe9f4ae84a239d5b2686f47a58c158aee2eb4 | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | 4a48fe59f29f673a3d042d679f26629a9c3e29d4 | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | 581800298313c9fd75e94985e6d37d21b7e35d34 | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | 3310fc11fc47387d1dd4759b0bc961643ea11c7f | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | 0b5a7826020706057cc5a9d9009e667027f221ee | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | ae88c8256547b63980770a9ea7be73a15900d27e | Unavailable | None listed |
| 4832c30d5458387ff2533ff66fbde26ad8bb5a2d | affected | git | 2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.14 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.14 | Unavailable | None listed |
| 5.10.253 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.203 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.167 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.130 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.77 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.17 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 6.19.7 | unaffected | semver | Unavailable | 6.19.* | None listed |
| 7.0 | unaffected | original_commit_for_fix | Unavailable | * | None listed |