CVE-2026-64538
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-ptr-deref in fib6_nh_mtu_change().
In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix null-ptr-deref in fib6_nh_mtu_change(). fib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and dereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown() clears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has released tb6_lock, so the RA-driven MTU walk can observe a NULL idev and oops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(), but this re-fetch is unguarded; nexthop-backed routes survive addrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is nulled. Return 0 when idev is NULL, matching rt6_mtu_change_route() and the fib6_mtu() fix in commit 5ad509c1fdad ("ipv6: Fix null-ptr-deref in fib6_mtu()."). Oops: general protection fault, ... KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] RIP: 0010:fib6_nh_mtu_change+0x203/0x990 rt6_mtu_change_route+0x141/0x1d0 __fib6_clean_all+0xd0/0x160 rt6_mtu_change+0xb4/0x100 ndisc_router_discovery+0x24b5/0x2cb0 icmpv6_rcv+0x12e9/0x1710 ipv6_rcv+0x39b/0x410
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) |
|---|---|---|---|---|---|
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | d08d019f2f43a6f9a71e81868bbc326b3afaf37b | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | 1451deca9896957159f0666520a792c1b861af4f | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | b2c70dd3326809429b709a9c7e9220d29923051a | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | 302d57ed7872838b40e56a868fb4c7da7da606e9 | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | 80600b5d0f3ecb9324120dc95b5e915130f516c5 | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | b0d0eb13a0441a8ebf4f227843deaf494f1e2c33 | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | 6428634f7a0b7878144b4925c37856bef3224967 | Unavailable | None listed |
| c0b220cf7d80eb8a36ae9f12cae6df4577a6814e | affected | git | 46c3b8191aad3d032776bf3bebf03efdf5f4b905 | 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) |
|---|---|---|---|---|---|
| 5.3 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.3 | Unavailable | None listed |
| 5.10.261 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.212 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.178 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.145 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.97 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.40 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.5 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |