CVE-2026-74611

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-74611

Key Details

CVE	CVE-2026-74611
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-14
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74611
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74611

Source

Reference

NVD

CVE