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SUSE Kernel RT Important Security Update Advisory 2026-3746

SUSE Kernel RT Important Security Update Advisory 2026-3746

Linuxsecurity •LinuxSecurity Advisories • August 25, 2026

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## This update for the SUSE Linux Enterprise Kernel 6.4.0-150700.7.40 fixes various security issues: The following security issues were fixed: * CVE-2025-40204,CVE-2026-53224,CVE-2026-53246: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing (bsc#1253437 bsc#1270023 bsc#1270024). * CVE-2026-23240: Amend fix for CVE-2026-23240 ("tls: Fix race condition in tls_sw_cancel_work_tx()") (bsc#1262404). * CVE-2026-23449: net/sched: teql: Fix double-free in teql_master_xmit (bsc#1262213). * CVE-2026-31629: nfc: llcp: add missing return after LLCP_CLOSED checks (bsc#1263791). * CVE-2026-43077: crypto: algif_aead - Fix minimum RX size check for decryption (bsc#1265306). * CVE-2026-43109: x86: shadow stacks: proper error handling for mmap lock (bsc#1269282).

## This update for the SUSE Linux Enterprise Kernel 6.4.0-150700.7.40 fixes various security issues: The following security issues were fixed: * CVE-2025-40204,CVE-2026-53224,CVE-2026-53246: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing (bsc#1253437 bsc#1270023 bsc#1270024). * CVE-2026-23240: Amend fix for CVE-2026-23240 ("tls: Fix race condition in tls_sw_cancel_work_tx()") (bsc#1262404). * CVE-2026-23449: net/sched: teql: Fix double-free in teql_master_xmit (bsc#1262213). * CVE-2026-31629: nfc: llcp: add missing return after LLCP_CLOSED checks (bsc#1263791). * CVE-2026-43077: crypto: algif_aead - Fix minimum RX size check for decryption (bsc#1265306). * CVE-2026-43109: x86: shadow stacks: proper error handling for mmap lock (bsc#1269282).

* CVE-2026-23240 ( SUSE ): 7.3

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

* CVE-2026-23240 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Announcement ID: SUSE-SU-2026:3746-1 Release Date: 2026-08-24T12:16:47Z Rating: important

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