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7.5
HIGH CVSS 3.1
CVE-2026-72330
net/tls: Consume empty data records in tls_sw_read_sock()
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: net/tls: Consume empty data records in tls_sw_read_sock() A peer may send a zero-length TLS application_data record; TLS 1.3 explicitly permits these as a traffic-analysis countermeasure (RFC 8446, Section 5.1). After decryption such a record has full_len == 0. tls_sw_read_sock() hands it to the read_actor, which has no payload to consume and returns zero. The loop treats a zero return as backpressure (used <= 0), requeues the skb at the head of rx_list, and stops. rx_list is serviced head-first on the next call, so the empty record is dequeued, fails the same way, and is requeued again; every later record on the connection is blocked behind it. tls_sw_recvmsg() does not stall on this: a zero-length data record copies nothing and falls through to consume_skb(). Mirror that in the read_sock() path by recognizing an empty data record before the actor runs, consuming it, and continuing.

Details
INFO

Published Date :

Aug. 15, 2026, 6:22 a.m.

Last Modified :

Aug. 17, 2026, 6:18 a.m.

Remotely Exploit :

Yes !

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-72330 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Apply the Linux kernel patch to handle empty TLS data records correctly.
  • Update the Linux kernel to the patched version.
  • Ensure tls_sw_read_sock() recognizes and consumes empty records.
  • Verify that empty records do not block subsequent data.
  • Test the fix in the tls_sw_recvmsg() path.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-72330.

URL Resource
https://git.kernel.org/stable/c/0867b0f2513ebc1c475af9898c97f4772a68d964
https://git.kernel.org/stable/c/3be28e2c9cd0230cb51fd4967df095273afd3848
https://git.kernel.org/stable/c/c6b440cf766a557b08d25f1b571b3d57d039686e
https://git.kernel.org/stable/c/e8a4c9fc437b16aef38f86ce3275677e36924259
https://git.kernel.org/stable/c/ebc295ce343600c2d60c1e1e0c5d192080217457
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72330 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72330 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-72330 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-72330 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': '0867b0f2513ebc1c475af9898c97f4772a68d964', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'c6b440cf766a557b08d25f1b571b3d57d039686e', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'e8a4c9fc437b16aef38f86ce3275677e36924259', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'ebc295ce343600c2d60c1e1e0c5d192080217457', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': '3be28e2c9cd0230cb51fd4967df095273afd3848', 'versionType': 'git'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': '0867b0f2513ebc1c475af9898c97f4772a68d964', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'c6b440cf766a557b08d25f1b571b3d57d039686e', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'e8a4c9fc437b16aef38f86ce3275677e36924259', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'ebc295ce343600c2d60c1e1e0c5d192080217457', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': '3be28e2c9cd0230cb51fd4967df095273afd3848', 'versionType': 'git'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': '0867b0f2513ebc1c475af9898c97f4772a68d964', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'c6b440cf766a557b08d25f1b571b3d57d039686e', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'e8a4c9fc437b16aef38f86ce3275677e36924259', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': 'ebc295ce343600c2d60c1e1e0c5d192080217457', 'versionType': 'git'}, {'status': 'affected', 'version': '662fbcec32f4af6bdcf5b4006b792ebe9543d945', 'lessThan': '3be28e2c9cd0230cb51fd4967df095273afd3848', 'versionType': 'git'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tls/tls_sw.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: net/tls: Consume empty data records in tls_sw_read_sock() A peer may send a zero-length TLS application_data record; TLS 1.3 explicitly permits these as a traffic-analysis countermeasure (RFC 8446, Section 5.1). After decryption such a record has full_len == 0. tls_sw_read_sock() hands it to the read_actor, which has no payload to consume and returns zero. The loop treats a zero return as backpressure (used <= 0), requeues the skb at the head of rx_list, and stops. rx_list is serviced head-first on the next call, so the empty record is dequeued, fails the same way, and is requeued again; every later record on the connection is blocked behind it. tls_sw_recvmsg() does not stall on this: a zero-length data record copies nothing and falls through to consume_skb(). Mirror that in the read_sock() path by recognizing an empty data record before the actor runs, consuming it, and continuing.
    Added Reference https://git.kernel.org/stable/c/0867b0f2513ebc1c475af9898c97f4772a68d964
    Added Reference https://git.kernel.org/stable/c/3be28e2c9cd0230cb51fd4967df095273afd3848
    Added Reference https://git.kernel.org/stable/c/c6b440cf766a557b08d25f1b571b3d57d039686e
    Added Reference https://git.kernel.org/stable/c/e8a4c9fc437b16aef38f86ce3275677e36924259
    Added Reference https://git.kernel.org/stable/c/ebc295ce343600c2d60c1e1e0c5d192080217457
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.5
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