CVE-2026-74610

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

tls: don't leave a full plaintext sk_msg ring unpushed

When the copy path in tls_sw_sendmsg_locked() adds the fragment that fills

the plaintext sk_msg ring, it does not set full_record, so the record is

left full and unpushed. A later splice() then adds to an already full

ring: sk_msg_page_add() has no fullness check of its own, so sg.end wraps

onto sg.start and the ring appears empty. Fragments added after that

overwrite live entries, and sg.size no longer matches what is reachable

between sg.start and sg.end, so pushing the record runs the scatterwalk off

the end of the scatterlist.

An unprivileged user can trigger this on a loopback TCP socket with the

"tls" ULP attached:

BUG: kernel NULL pointer dereference, address: 0000000000000008

RIP: 0010:memcpy_from_scatterwalk+0x32/0xc0

Call Trace:

skcipher_walk_next+0x1d1/0x2c0

gcm_encrypt_aesni_avx+0x1e9/0x220

bpf_exec_tx_verdict+0x3bb/0x860

tls_sw_

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References