net/tls: Consume empty data records in tls_sw_read_sock()
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.
CVE-2026-72330
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-72330
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-72330
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33024 · Revision 1
- Added to Heist Feed
- Publisher date