CVE-2025-38465 (GCVE-0-2025-38465)

Vulnerability from cvelistv5 – Published: 2025-07-25 15:27 – Updated: 2025-11-03 17:38
VLAI?
Title
netlink: Fix wraparounds of sk->sk_rmem_alloc.
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9da025150b7c14a8390fc06aea314c0a4011e82c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fd69af06101090eaa60b3d216ae715f9c0a58e5b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 76602d8e13864524382b0687dc32cd8f19164d5a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 55baecb9eb90238f60a8350660d6762046ebd3bd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4b8e18af7bea92f8b7fb92d40aeae729209db250 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cd7ff61bfffd7000143c42bbffb85eeb792466d6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: Fix wraparounds of sk-\u003esk_rmem_alloc.\n\nNetlink has this pattern in some places\n\n  if (atomic_read(\u0026sk-\u003esk_rmem_alloc) \u003e sk-\u003esk_rcvbuf)\n  \tatomic_add(skb-\u003etruesize, \u0026sk-\u003esk_rmem_alloc);\n\n, which has the same problem fixed by commit 5a465a0da13e (\"udp:\nFix multiple wraparounds of sk-\u003esk_rmem_alloc.\").\n\nFor example, if we set INT_MAX to SO_RCVBUFFORCE, the condition\nis always false as the two operands are of int.\n\nThen, a single socket can eat as many skb as possible until OOM\nhappens, and we can see multiple wraparounds of sk-\u003esk_rmem_alloc.\n\nLet\u0027s fix it by using atomic_add_return() and comparing the two\nvariables as unsigned int.\n\nBefore:\n  [root@fedora ~]# ss -f netlink\n  Recv-Q      Send-Q Local Address:Port                Peer Address:Port\n  -1668710080 0               rtnl:nl_wraparound/293               *\n\nAfter:\n  [root@fedora ~]# ss -f netlink\n  Recv-Q     Send-Q Local Address:Port                Peer Address:Port\n  2147483072 0               rtnl:nl_wraparound/290               *\n  ^\n  `--- INT_MAX - 576"
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