Bug 2426248 (CVE-2023-54306)

Summary:	CVE-2023-54306 kernel: net: tls: avoid hanging tasks on the tx_lock
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A denial-of-service flaw was found in the Linux kernel's TLS implementation. An adversarial network receiver can keep the TCP receive window (RWIN) at zero for extended periods, causing a thread holding the tx_lock to sleep indefinitely. Other tasks waiting for this lock become hung, leading to system unresponsiveness.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-30 13:19:14 UTC

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

net: tls: avoid hanging tasks on the tx_lock

syzbot sent a hung task report and Eric explains that adversarial
receiver may keep RWIN at 0 for a long time, so we are not guaranteed
to make forward progress. Thread which took tx_lock and went to sleep
may not release tx_lock for hours. Use interruptible sleep where
possible and reschedule the work if it can't take the lock.

Testing: existing selftest passes

Comment 1 Alexander B 2025-12-30 22:14:41 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123034-CVE-2023-54306-e40f@gregkh/T