What’s Vulnerable › Vulnerabilities

CVE-2023-54306: net: tls: avoid hanging tasks on the tx_lock

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-10-15

Description

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

Affected products

• Linux kernel: from 5.3.11 before 5.4; 5.4 — fixed in 5.4, 6.3

How to fix

Upgrade to a fixed version: Linux kernel 5.4, 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1f800f6aae57d2d8f63d32fff383017cbc11cf65
• https://git.kernel.org/stable/c/7123a4337bf73132bbfb5437e4dc83ba864a9a1e
• https://git.kernel.org/stable/c/bde541a57b4204d0a800afbbd3d1c06c9cdb133f
• https://git.kernel.org/stable/c/be5d5d0637fd88c18ee76024bdb22649a1de00d6
• https://git.kernel.org/stable/c/ccf1ccdc5926907befbe880b562b2a4b5f44c087
• https://git.kernel.org/stable/c/f3221361dc85d4de22586ce8441ec2c67b454f5d

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