PT-2026-65213 · Linux · Linux
CVE-2026-64538
·
Publicado
2026-07-27
·
Atualizado
2026-07-27
Nenhuma
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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
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