Linux kernel TLS vulnerability affects widely deployed kernels; remote TLS peers can trigger memory corruption across servers and networked devices, posing broad infrastructure risk.
CVE-2026-74611
Linux kernel TLS 1.3 zero-copy bug allows recvmsg() buffer overwrite by peer.
Is CVE-2026-74611 being exploited?
Not confirmed. CVE-2026-74611 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-74611?
CVE-2026-74611 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-74611?
Yes. A fix has been recorded for CVE-2026-74611. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74611 affect?
CVE-2026-74611 affects Linux kernel (TLS subsystem), Kernels with TLS 1.3 zero-copy and TLS_RX_EXPECT_NO_PAD enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74611?
Install kernel security updates ASAP; block untrusted TLS peers or disable zero-copy TLS RX until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A remote TLS peer can cause recvmsg() to overwrite later user iovecs, leading to memory corruption, data overwrite, DoS or potential code execution.
Immediate action required
- affected>= ce61327ce989b63c0bd1cc7afee00e218ee696ac and < 68787940274ec89f41dc91b1a68ee1a16a90735f
- affected>= ce61327ce989b63c0bd1cc7afee00e218ee696ac and < 3c837266a734e2a22b24d2d567404a501d405835
- affected>= ce61327ce989b63c0bd1cc7afee00e218ee696ac and < 1c8629651cb54f7b51db8fc0b1a9944e4a4b0f5e
- affected6.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.