CVE-2025-40248 Affecting kernel-tools-debuginfo package, versions <0:4.18.0-553.97.1.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-ROCKY8-KERNELTOOLSDEBUGINFO-15201927
  • published4 Feb 2026
  • disclosed4 Dec 2025

Introduced: 4 Dec 2025

CVE-2025-40248  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 kernel-tools-debuginfo to version 0:4.18.0-553.97.1.el8_10 or higher.
This issue was patched in RLSA-2026:1142.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-tools-debuginfo package and not the kernel-tools-debuginfo package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

vsock: Ignore signal/timeout on connect() if already established

During connect(), acting on a signal/timeout by disconnecting an already established socket leads to several issues:

  1. connect() invoking vsock_transport_cancel_pkt() -> virtio_transport_purge_skbs() may race with sendmsg() invoking virtio_transport_get_credit(). This results in a permanently elevated vvs-&gt;bytes_unsent. Which, in turn, confuses the SOCK_LINGER handling.

  2. connect() resetting a connected socket's state may race with socket being placed in a sockmap. A disconnected socket remaining in a sockmap breaks sockmap's assumptions. And gives rise to WARNs.

  3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a transport change/drop after TCP_ESTABLISHED. Which poses a problem for any simultaneous sendmsg() or connect() and may result in a use-after-free/null-ptr-deref.

Do not disconnect socket on signal/timeout. Keep the logic for unconnected sockets: they don't linger, can't be placed in a sockmap, are rejected by sendmsg().

CVSS Base Scores

version 3.1