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CVE-2026-98394

Unknown

Last modified

CVE-2026-98394 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer. Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait in unix_stream_read_generic() if recv() is blocking and the last skb in the queue is MSG_OOB skb. In such a situation, TCP returns 0 immediately regardless of blocking or non-blocking. Let's follow the behaviour..

Description

In the Linux kernel, the following vulnerability has been resolved: af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer. Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait in unix_stream_read_generic() if recv() is blocking and the last skb in the queue is MSG_OOB skb. In such a situation, TCP returns 0 immediately regardless of blocking or non-blocking. Let's follow the behaviour.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 314001f0bf927015e459c9d387d62a231fe93af3, < 3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713; >= 314001f0bf927015e459c9d387d62a231fe93af3, < d5dd55b316ca229a4cbf11729483ba5bb57233e7; >= 314001f0bf927015e459c9d387d62a231fe93af3, < c81c5be3826c8467945b964d0cf7f7b3d65461db; >= 314001f0bf927015e459c9d387d62a231fe93af3, < 6e5ee08eb5858d175da6768d75d163817b6a9d4a
LinuxLinux5.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98394?
In the Linux kernel, the following vulnerability has been resolved: af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer. Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait in unix_stream_read_generic() if recv() is blocking and the last skb in the queue is MSG_OOB skb. In such a situation, TCP returns 0 immediately regardless of blocking or non-blocking. Let's follow the behaviour.
How severe is CVE-2026-98394?
Severity scoring for CVE-2026-98394 is pending analysis.
How do I fix CVE-2026-98394?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST