CVE-2026-46168
Analyzed Analyzed - Analysis Complete
Linux Kernel MPTCP sockopt Timestamp Scheduling Fix

Publication date: 2026-05-28

Last updated on: 2026-06-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix scheduling with atomic in timestamp sockopt Using lock_sock_fast() (atomic context) around sock_set_timestamp() and sock_set_timestamping() is unsafe, as both helpers can sleep. Replace lock_sock_fast() with sleepable lock_sock()/release_sock() to avoid scheduling while atomic panic.
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Meta Information
Published
2026-05-28
Last Modified
2026-06-10
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46168
EUVD
EUVD-2026-32795
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.1
linux linux_kernel From 6.13 (inc) to 6.18.30 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.175 (exc)
linux linux_kernel From 6.19 (inc) to 7.0.7 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.88 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.140 (exc)
linux linux_kernel From 5.14 (inc) to 5.15.209 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves improper locking in the Multipath TCP (mptcp) implementation. Specifically, the code used lock_sock_fast() in an atomic context around the functions sock_set_timestamp() and sock_set_timestamping(), but these functions can sleep, which is unsafe in atomic context.

The fix replaces lock_sock_fast() with the sleepable lock_sock() and release_sock() functions to avoid scheduling while in atomic context, preventing potential kernel panics.

Impact Analysis

This vulnerability can cause the Linux kernel to panic due to unsafe scheduling in atomic context. Kernel panics can lead to system crashes, resulting in downtime and potential loss of data or service availability.

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