handshake: Require admin permission for DONE command
In the Linux kernel, the following vulnerability has been resolved: handshake: Require admin permission for DONE command ACCEPT and DONE are the two downcalls of the handshake genl family, both intended for use by the trusted handshake agent (tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has no privilege check at all. The fd-lookup in handshake_nl_done_doit() only confirms that some pending handshake request exists for the supplied sockfd; it does not authenticate the sender. An unprivileged process that guesses or observes a valid sockfd can therefore submit a DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel consumer to proceed as if the handshake succeeded. A non-zero status on a forged DONE tears down a legitimate in-flight handshake before tlshd can report its real result.
CVE-2026-74270
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-2026-74270
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": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
"lessThan": "25fb53e43ec006ac69b9e825a7e8a11d63a6083e",
"versionType": "git"
},
{
"status": "affected",
"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
"lessThan": "b6557f912509abe8e70223373dd7a44d1d4a0d6c",
"versionType": "git"
},
{
"status": "affected",
"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
"lessThan": "67cec2f1eb9e58719d622e92e2278ceda72dbd85",
"versionType": "git"
},
{
"status": "affected",
"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
"lessThan": "4dafc411948469277b276724c3b2b4408c02c04c",
"versionType": "git"
},
{
"status": "affected",
"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
"lessThan": "81246a65303d9635266b1334490142caaf86a11f",
"versionType": "git"
}
],
"programFiles": [
"Documentation/netlink/specs/handshake.yaml",
"net/handshake/genl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"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": [
"Documentation/netlink/specs/handshake.yaml",
"net/handshake/genl.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74270
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33077 · Revision 1
- Added to Heist Feed
- Publisher date