tls: rx: restore msg_iter before TLS 1.3 optimistic retry
In the Linux kernel, the following vulnerability has been resolved: tls: rx: restore msg_iter before TLS 1.3 optimistic retry tls_decrypt_sg() advances msg->msg_iter when it maps user pages for the optimistic TLS 1.3 zero-copy path. If the decrypted record turns out not to be unpadded application data, tls_decrypt_sw() retries into a kernel skb, but leaves the iterator advanced. The subsequent copy from the skb then writes decrypted bytes again at a later point in the caller iovecs while recvmsg() reports only the post-retry length. A TLS peer can trigger this after the receiver enables TLS_RX_EXPECT_NO_PAD. Revert the iterator by the number of bytes consumed by the optimistic mapping before retrying without zero-copy. Add a selftest which sends a TLS 1.3 control record with TLS_RX_EXPECT_NO_PAD enabled and verifies that recvmsg() does not overwrite later iovecs beyond the returned length.
CVE-2026-74611
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-2026-74611
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": "ce61327ce989b63c0bd1cc7afee00e218ee696ac",
"lessThan": "c71bacacd59166adbea423a04e7474b0e8245b84",
"versionType": "git"
},
{
"status": "affected",
"version": "ce61327ce989b63c0bd1cc7afee00e218ee696ac",
"lessThan": "3c4e21b1bf8e666a1c141e0f5813ece929570deb",
"versionType": "git"
},
{
"status": "affected",
"version": "ce61327ce989b63c0bd1cc7afee00e218ee696ac",
"lessThan": "68787940274ec89f41dc91b1a68ee1a16a90735f",
"versionType": "git"
},
{
"status": "affected",
"version": "ce61327ce989b63c0bd1cc7afee00e218ee696ac",
"lessThan": "3c837266a734e2a22b24d2d567404a501d405835",
"versionType": "git"
},
{
"status": "affected",
"version": "ce61327ce989b63c0bd1cc7afee00e218ee696ac",
"lessThan": "1c8629651cb54f7b51db8fc0b1a9944e4a4b0f5e",
"versionType": "git"
}
],
"programFiles": [
"net/tls/tls_sw.c",
"tools/testing/selftests/net/tls.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/tls/tls_sw.c",
"tools/testing/selftests/net/tls.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74611
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #46583 · Revision 1
- Added to Heist Feed
- Publisher date