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CVE-2025-38465netlink: Fix wraparounds of sk->sk_rmem_alloc.

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

Timeline

  1. ID reserved

    By Linux

  2. · 3 months later

    Published

  3. · 16 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-38465, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.20% · top 90% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 9da025150b7c14a8390fc06aea314c0a4011e82c
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < fd69af06101090eaa60b3d216ae715f9c0a58e5b
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 76602d8e13864524382b0687dc32cd8f19164d5a
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 55baecb9eb90238f60a8350660d6762046ebd3bd
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 4b8e18af7bea92f8b7fb92d40aeae729209db250
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < cd7ff61bfffd7000143c42bbffb85eeb792466d6
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc

  • Linux · Linux

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

References

References11

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .