net/tls: Consume empty data records in tls_sw_read_sock()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72330
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:06 UTC
Updated2026-08-17 06:18:36 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006300000 probability, percentile 0.472430000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 662fbcec32f4af6bdcf5b4006b792ebe9543d945 0867b0f2513ebc1c475af9898c97f4772a68d964 git Not specified
CNA Linux Linux affected 662fbcec32f4af6bdcf5b4006b792ebe9543d945 c6b440cf766a557b08d25f1b571b3d57d039686e git Not specified
CNA Linux Linux affected 662fbcec32f4af6bdcf5b4006b792ebe9543d945 e8a4c9fc437b16aef38f86ce3275677e36924259 git Not specified
CNA Linux Linux affected 662fbcec32f4af6bdcf5b4006b792ebe9543d945 ebc295ce343600c2d60c1e1e0c5d192080217457 git Not specified
CNA Linux Linux affected 662fbcec32f4af6bdcf5b4006b792ebe9543d945 3be28e2c9cd0230cb51fd4967df095273afd3848 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3be28e2c9cd0230cb51fd4967df095273afd3848 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ebc295ce343600c2d60c1e1e0c5d192080217457 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0867b0f2513ebc1c475af9898c97f4772a68d964 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e8a4c9fc437b16aef38f86ce3275677e36924259 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c6b440cf766a557b08d25f1b571b3d57d039686e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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