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CVE-2025-38465

netlink: Fix wraparounds of sk->sk_rmem_alloc.

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.296, 5.10.240, 5.15.189, 6.1.146, 6.6.99, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 9da025150b7c14a8390fc06aea314c0a4011e82c; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in fd69af06101090eaa60b3d216ae715f9c0a58e5b; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 76602d8e13864524382b0687dc32cd8f19164d5a; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 55baecb9eb90238f60a8350660d6762046ebd3bd; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 4b8e18af7bea92f8b7fb92d40aeae729209db250; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in cd7ff61bfffd7000143c42bbffb85eeb792466d6; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.4.296; From 5.5.0 · fixed in 5.10.240; From 5.11.0 · fixed in 5.15.189; From 5.16.0 · fixed in 6.1.146; From 6.2.0 · fixed in 6.6.99; From 6.7.0 · fixed in 6.12.39; From 6.13.0 · fixed in 6.15.7

References 8

git.kernel.org