CVE-2025-40248: vsock: Ignore signal/timeout on connect() if already established

Q: What is the severity of CVE-2025-40248?

CVE-2025-40248 has a medium severity rating due to the potential impact on established socket connections.

Q: How do I fix CVE-2025-40248?

To fix CVE-2025-40248, ensure you update your Linux kernel to the latest stable version where this vulnerability has been patched.

Q: What systems are affected by CVE-2025-40248?

CVE-2025-40248 affects various versions of the Linux kernel utilizing the vsock protocol.

Q: What are the consequences of CVE-2025-40248?

The consequences of CVE-2025-40248 include possible disconnections of established sockets upon receiving signals or timeouts during connect().

Q: How does CVE-2025-40248 impact network communication?

CVE-2025-40248 can disrupt network communication by improperly handling socket connections, leading to instability.

Published Dec 4, 2025

Updated

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 vsocktransportcancelpkt() - virtiotransportpurgeskbs() may race with sendmsg() invoking virtiotransportgetcredit(). This results in a permanently elevated vvs-bytesunsent. Which, in turn, confuses the SOCKLINGER 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 SSCONNECTED - SSUNCONNECTED allows for a transport change/drop after TCPESTABLISHED. 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().

[1]:

Other sources

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 vsocktransportcancelpkt() -> virtiotransportpurgeskbs() may race with sendmsg() invoking virtiotransportgetcredit(). This results in a permanently elevated vvs->bytesunsent. Which, in turn, confuses the SOCKLINGER 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 SSCONNECTED -> SSUNCONNECTED allows for a transport change/drop after TCPESTABLISHED. 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().

[1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/ [2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/ [3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/

— Red Hat

Affected Software

249 affected componentsFixes available

Linux Kernel

Microsoft azl3 kernel 6.6.112.1-2

Microsoft azl3 kernel 6.6.117.1-1

Patch available

IBM Verify Identity Access<=11.0 - 11.0.2

IBM Security Verify Access<=10.0 - 10.0.9.1

IBM Verify Identity Access Container<=11.0 - 11.0.2

IBM Security Verify Access Container<=10.0 - 10.0.9.1

ubuntu/linux*

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ubuntu/linux*

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ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

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ubuntu/linux-aws-5.0*

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5.15.0-1097.100

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ubuntu/linux-nvidia-tegra<6.8.0-1020.20

6.8.0-1020.20

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17<6.17.0-1017.17

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ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1047.48

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ubuntu/linux-realtime*

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6.17.0-1010.10

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6.17.0-1008.9

ubuntu/linux-riscv<6.17.0-19.19.1

6.17.0-19.19.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 6.8.0-1058.65
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Fixed in 6.8.0-1052.55
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Fixed in 6.17.0-1009.9~24.04.3
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Fixed in 6.8.0-1048.53
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Fixed in 6.8.0-1035.38
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Fixed in 6.17.0-19.19~24.04.2
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Fixed in 6.8.0-1049.49
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Fixed in 6.8.0-106.106.1
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Fixed in 6.8.0-1049.52
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Fixed in 6.17.0-1018.18
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Fixed in 6.8.0-1049.52.1
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Fixed in 6.8.0-1020.20
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Fixed in 6.17.0-1017.17
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Fixed in 6.8.0-1047.48
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Fixed in 6.17.0-1009.9~24.04.1
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Fixed in 6.8.0-1050.54
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Fixed in 6.17.0-19.19.1~24.04.1
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Fixed in 6.8.0-1028.29
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Fixed in 6.8.0-1017.21
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Fixed in 6.8.0-2040.41
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Fixed in 6.8.1-1045.46
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Fixed in 6.17.0-1008.9~24.04.1
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Fixed in 6.8.0-1050.53+fips1
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Fixed in 6.8.0-1052.58+fips1
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Fixed in 6.8.0-106.106+fips1
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Fixed in 6.8.0-1052.55+fips1
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Fixed in 6.17.0-19.19
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Fixed in 6.17.0-1009.9
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Fixed in 6.17.0-1010.10
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Fixed in 6.17.0-1009.9
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Fixed in 6.17.0-1009.9
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Fixed in 6.17.0-1010.10
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Fixed in 6.17.0-1008.9
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Fixed in 6.17.0-19.19.1

Event History

Dec 4, 2025

CVE Published

via MITRE·04:08 PM

Data Sourced

via MITRE·04:08 PM

DescriptionSeverity

Data Sourced

via OSV·04:16 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·04:16 PM

DescriptionSeverity

Data Sourced

via Red Hat·05:02 PM

DescriptionSeverityAffected Software

Dec 6, 2025

Data Sourced

via Microsoft·01:02 AM

DescriptionSeverityWeaknessAffected Software

Jul 8, 2026

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

IBM-7279510

Frequently Asked Questions

What is the severity of CVE-2025-40248?

CVE-2025-40248 has a medium severity rating due to the potential impact on established socket connections.

How do I fix CVE-2025-40248?

To fix CVE-2025-40248, ensure you update your Linux kernel to the latest stable version where this vulnerability has been patched.

What systems are affected by CVE-2025-40248?

CVE-2025-40248 affects various versions of the Linux kernel utilizing the vsock protocol.

What are the consequences of CVE-2025-40248?

The consequences of CVE-2025-40248 include possible disconnections of established sockets upon receiving signals or timeouts during connect().

How does CVE-2025-40248 impact network communication?

CVE-2025-40248 can disrupt network communication by improperly handling socket connections, leading to instability.

CVE-2025-40248: vsock: Ignore signal/timeout on connect() if already established

Other sources

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

What is the severity of CVE-2025-40248?

How do I fix CVE-2025-40248?

What systems are affected by CVE-2025-40248?

What are the consequences of CVE-2025-40248?

How does CVE-2025-40248 impact network communication?

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