net: tls: prevent chain-after-chain in plain text SG
In the Linux kernel, the following vulnerability has been resolved: net: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.
CVE-2026-64046
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-2026-64046
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": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "49a5faaa471ddcd37b6893970c9916eb836e7c31",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "91359966e247c0244c66d50bbb8e74aefa4321c3",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "410351158dfef2d67fea6603680b3a6013c6ed9d",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "acdc12b71c9aa4be5dcd2c8062753c6d2033e235",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "929b1548e63ac72e104c07d8ee8cbbeeba2fa89a",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "af855f4c966afafef74faf8390c7b86568c0d46d",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36",
"versionType": "git"
},
{
"status": "affected",
"version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
"lessThan": "ff26a0e8377dec07e4a7230db7675bed1b9a6d03",
"versionType": "git"
},
{
"status": "affected",
"version": "d529d6c9f7e3aaeac13c4948f79799ccb825f29d",
"versionType": "git"
},
{
"status": "affected",
"version": "5.4.14",
"lessThan": "5.5",
"versionType": "semver"
}
],
"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": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/tls/tls_sw.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64046
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40945 · Revision 1
- Added to Heist Feed
- Publisher date