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CVE Record

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

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

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-54306 is a Linux kernel TLS issue where a peer can keep a connection from making progress long enough that kernel tasks wait on a transmit lock for hours. The practical concern is availability, not data theft, based on the provided sources.

Executive priority

Handle through normal to accelerated kernel patch management, especially for availability-sensitive Linux services. There is no source evidence of active exploitation, but the bug can create long-running kernel task stalls under adversarial network behavior.

Technical view

The Linux kernel net/tls code could sleep while holding tx_lock when a receiver keeps the TCP receive window at zero. The fix changes waiting behavior to use interruptible sleep where possible and reschedules work if the lock cannot be acquired.

Likely exposure

Exposure is most relevant to Linux systems running affected kernel versions or commits with kernel TLS paths in use. The source data lists Linux as affected but does not identify distributions, appliances, or default configurations.

Exploitation context

The provided record does not show CISA KEV listing or active exploitation. The issue was reported through syzbot as a hung task condition, with an adversarial receiver described as able to keep RWIN at zero.

Researcher notes

The bundle provides no CVSS, CWE, exploit status, or distribution package mapping. Analysis should stay scoped to Linux kernel net/tls behavior and the stable commits. Avoid assuming impact beyond availability unless additional vendor evidence appears.

Mitigation direction

  • Apply Linux kernel updates that include the referenced stable fixes.
  • Check distribution vendor advisories for backported fixed kernel packages.
  • Prioritize internet-facing or high-availability systems using TLS-heavy services.
  • Review whether kernel TLS is enabled or required in exposed workloads.
  • Use vendor guidance before changing TLS offload or kernel TLS behavior.

Validation and detection

  • Inventory kernel versions across Linux hosts and images.
  • Map running kernels to vendor advisories or referenced stable commit fixes.
  • Identify services or stacks using kernel TLS where practical.
  • Review kernel logs for hung tasks involving net/tls or tx_lock.
  • Confirm patched kernels are deployed after maintenance.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2023-54306 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
7Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux79ffe6087e9145d2377385cac48d0d6a6b4225a5, 79ffe6087e9145d2377385cac48d0d6a6b4225a5, 79ffe6087e9145d2377385cac48d0d6a6b4225a5, 79ffe6087e9145d2377385cac48d0d6a6b4225a5, 79ffe6087e9145d2377385cac48d0d6a6b4225a5, 79ffe6087e9145d2377385cac48d0d6a6b4225a5, c8d6817345f4ba228d07380e571676405e112872, 5.3.11unaffected
LinuxLinux5.4, 0, 5.4.235, 5.10.173, 5.15.100, 6.1.18, 6.2.5, 6.3affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.