Answer in brief
CVE-2026-74270 records a Unknown severity vulnerability in handshake: Require admin permission for DONE command. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <25fb53e43ec006ac69b9e825a7e8a11d63a6083e || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <b6557f912509abe8e70223373dd7a44d1d4a0d6c || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <67cec2f1eb9e58719d622e92e2278ceda72dbd85 || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <4dafc411948469277b276724c3b2b4408c02c04c || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <81246a65303d9635266b1334490142caaf86a11f | 25fb53e43ec006ac69b9e825a7e8a11d63a6083e, b6557f912509abe8e70223373dd7a44d1d4a0d6c, 67cec2f1eb9e58719d622e92e2278ceda72dbd85, 4dafc411948469277b276724c3b2b4408c02c04c, 81246a65303d9635266b1334490142caaf86a11f |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74270 records a Unknown severity vulnerability in handshake: Require admin permission for DONE command. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <25fb53e43ec006ac69b9e825a7e8a11d63a6083e || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <b6557f912509abe8e70223373dd7a44d1d4a0d6c || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <67cec2f1eb9e58719d622e92e2278ceda72dbd85 || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <4dafc411948469277b276724c3b2b4408c02c04c || >=3b3009ea8abb713b022d94fba95ec270cf6e7eae <81246a65303d9635266b1334490142caaf86a11f | 25fb53e43ec006ac69b9e825a7e8a11d63a6083e, b6557f912509abe8e70223373dd7a44d1d4a0d6c, 67cec2f1eb9e58719d622e92e2278ceda72dbd85, 4dafc411948469277b276724c3b2b4408c02c04c, 81246a65303d9635266b1334490142caaf86a11f |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.