CVE-2025-38465netlink: Fix wraparounds of sk->sk_rmem_alloc.
Updated under an hour ago ()
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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
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Not yet received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9da025150b7c14a8390fc06aea314c0a4011e82c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fd69af06101090eaa60b3d216ae715f9c0a58e5b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 76602d8e13864524382b0687dc32cd8f19164d5a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 55baecb9eb90238f60a8350660d6762046ebd3bd; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4b8e18af7bea92f8b7fb92d40aeae729209db250; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cd7ff61bfffd7000143c42bbffb85eeb792466d6; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
References
- https://git.kernel.org/stable/c/9da025150b7c14a8390fc06aea314c0a4011e82c
- https://git.kernel.org/stable/c/c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98
- https://git.kernel.org/stable/c/fd69af06101090eaa60b3d216ae715f9c0a58e5b
- https://git.kernel.org/stable/c/76602d8e13864524382b0687dc32cd8f19164d5a
- https://git.kernel.org/stable/c/55baecb9eb90238f60a8350660d6762046ebd3bd
- https://git.kernel.org/stable/c/4b8e18af7bea92f8b7fb92d40aeae729209db250
- https://git.kernel.org/stable/c/cd7ff61bfffd7000143c42bbffb85eeb792466d6
- https://git.kernel.org/stable/c/ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.