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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-38465

netlink: Fix wraparounds of sk->sk_rmem_alloc.

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9da025150b7c14a8390fc06aea314c0a4011e82caffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fd69af06101090eaa60b3d216ae715f9c0a58e5baffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 76602d8e13864524382b0687dc32cd8f19164d5aaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 55baecb9eb90238f60a8350660d6762046ebd3bdaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4b8e18af7bea92f8b7fb92d40aeae729209db250affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < cd7ff61bfffd7000143c42bbffb85eeb792466d6affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ae8f160e7eb24240a2a79fc4c815c6a0d4ee16ccaffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.4.296 to ≤ 5.4.*unaffected
  • 5.10.240 to ≤ 5.10.*unaffected
  • 5.15.189 to ≤ 5.15.*unaffected
  • 6.1.146 to ≤ 6.1.*unaffected
  • 6.6.99 to ≤ 6.6.*unaffected
  • 6.12.39 to ≤ 6.12.*unaffected
  • 6.15.7 to ≤ 6.15.*unaffected
  • 6.16 to ≤ *unaffected

References