Tracker / CVE-2025-38465
CVE-2025-38465
In the Linux kernel, the following vulnerability has been resolved: netlink: Fix wraparounds of sk->sk_rmem_alloc. Netlink has this pattern in some places if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) atomic_add(skb->truesize, &sk->sk_rmem_alloc); , which has the same problem fixed by commit 5a465a0da13e ("udp: Fix multiple wraparounds of sk->sk_rmem_alloc."). For example, if we set INT_MAX to SO_RCVBUFFORCE, the condition is always false as the two operands are of int. Then, a single socket can eat as many skb as possible until OOM happens, and we can see multiple wraparounds of sk->sk_rmem_alloc. Let's fix it by using atomic_add_return() and comparing the two variables as unsigned int. Before: [root@fedora ~]# ss -f netlink Recv-Q Send-Q Local Address:Port Peer Address:Port -1668710080 0 rtnl:nl_wraparound/293 * After: [root@fedora ~]# ss -f netlink Recv-Q Send-Q Local Address:Port Peer Address:Port 2147483072 0 rtnl:nl_wraparound/290 * ^ `--- INT_MAX - 576
Prodotti e versioni affette
| debian | debian_linux |
|---|---|
| linux | linux_kernel |
| linux | linux_kernel · 2.6.13 → 5.4.296 |
| linux | linux_kernel · 5.11 → 5.15.189 |
| linux | linux_kernel · 5.16 → 6.1.146 |
| linux | linux_kernel · 5.5 → 5.10.240 |
| linux | linux_kernel · 6.13 → 6.15.7 |
| linux | linux_kernel · 6.2 → 6.6.99 |
| linux | linux_kernel · 6.7 → 6.12.39 |