CVE-2026-89637
kernel-64kb: smb: client: fix UAF and buffer leak in cifs_check_trans2() for malformed secondary T2 (bsc#1280492).
CVE-2026-89637 is fixed in 66 products on 1 platform, first by DEBIAN-CVE-2026-89637, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Urgent
CVSS
9.8
critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0060
49th percentile
smb: client: fix UAF and buffer leak in cifs_check_trans2() for malformed secondary T2 (bsc#1280492).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| bpftool-debuginfo · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| bpftool6.12 · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| bpftool6.12-debuginfo · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| bpftool6.18 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| bpftool6.18-debuginfo · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-64kb · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-azure · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-debuginfo · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-debuginfo-common-aarch64 · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-debuginfo-common-x86_64 · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-default · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-default-base · sles 15.7 | 6.4.0-150700.53.90.1.150700.17.51.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-devel · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-docs · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-headers · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-livepatch-6.1.188-233.393 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-livepatch-6.12.111-136.204 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel-livepatch-6.18.51-120.162 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel-livepatch-SLE15-SP7_Update_24 · sles 15.7 | 1-150700.15.3.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-modules-extra · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-modules-extra-common · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-obs-build · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-source · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-syms · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel-tools · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-tools-debuginfo · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-tools-devel · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| kernel-zfcpdump · sles 15.7 | 6.4.0-150700.53.90.1 | SUSE-SU-2026:5091-1 | Nov 7, 2026 |
| kernel6.12 · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-debuginfo · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-debuginfo-common-aarch64 · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-debuginfo-common-x86_64 · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-devel · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-headers · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-modules-extra · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-modules-extra-common · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-tools · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-tools-debuginfo · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.12-tools-devel · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| kernel6.18 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-debuginfo · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-debuginfo-common-aarch64 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-debuginfo-common-x86_64 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-devel · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-headers · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-modules-extra · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-modules-extra-common · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-tools · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-tools-debuginfo · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| kernel6.18-tools-devel · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| linux · Debian 14 | 7.2.6-1 | DEBIAN-CVE-2026-89637 | Sep 23, 2026 |
| microvm-kernel6.18 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| perf · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| perf-debuginfo · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| perf6.12 · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| perf6.12-debuginfo · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| perf6.18 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| perf6.18-debuginfo · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| python3-perf · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| python3-perf-debuginfo · amzn 2023 | 1:6.1.188-233.393.amzn2023 | ALAS2023-2026-3183 | Nov 7, 2026 |
| python3-perf6.12 · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| python3-perf6.12-debuginfo · amzn 2023 | 1:6.12.111-136.204.amzn2023 | ALAS2023-2026-3193 | Nov 7, 2026 |
| python3-perf6.18 · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
| python3-perf6.18-debuginfo · amzn 2023 | 1:6.18.51-120.162.amzn2023 | ALAS2023-2026-3187 | Nov 7, 2026 |
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