High severity7.8NVD Advisory· Published May 1, 2026· Updated May 8, 2026
CVE-2026-43020
CVE-2026-43020
Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: MGMT: validate LTK enc_size on load
Load Long Term Keys stores the user-provided enc_size and later uses it to size fixed-size stack operations when replying to LE LTK requests. An enc_size larger than the 16-byte key buffer can therefore overflow the reply stack buffer.
Reject oversized enc_size values while validating the management LTK record so invalid keys never reach the stored key state.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
91cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 6 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=3.4,<5.10.253
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- osv-coords84 versionspkg:rpm/almalinux/bpftoolpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-64kpkg:rpm/almalinux/kernel-64k-corepkg:rpm/almalinux/kernel-64k-debugpkg:rpm/almalinux/kernel-64k-debug-corepkg:rpm/almalinux/kernel-64k-debug-develpkg:rpm/almalinux/kernel-64k-debug-devel-matchedpkg:rpm/almalinux/kernel-64k-debug-modulespkg:rpm/almalinux/kernel-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-debug-modules-extrapkg:rpm/almalinux/kernel-64k-develpkg:rpm/almalinux/kernel-64k-devel-matchedpkg:rpm/almalinux/kernel-64k-modulespkg:rpm/almalinux/kernel-64k-modules-corepkg:rpm/almalinux/kernel-64k-modules-extrapkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-debug-devel-matchedpkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-debug-modules-corepkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-debug-uki-virtpkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-devel-matchedpkg:rpm/almalinux/kernel-docpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-modules-corepkg:rpm/almalinux/kernel-modules-extrapkg:rpm/almalinux/kernel-modules-extra-matchedpkg:rpm/almalinux/kernel-rtpkg:rpm/almalinux/kernel-rt-64kpkg:rpm/almalinux/kernel-rt-64k-corepkg:rpm/almalinux/kernel-rt-64k-debugpkg:rpm/almalinux/kernel-rt-64k-debug-corepkg:rpm/almalinux/kernel-rt-64k-debug-develpkg:rpm/almalinux/kernel-rt-64k-debug-modulespkg:rpm/almalinux/kernel-rt-64k-debug-modules-corepkg:rpm/almalinux/kernel-rt-64k-debug-modules-extrapkg:rpm/almalinux/kernel-rt-64k-develpkg:rpm/almalinux/kernel-rt-64k-modulespkg:rpm/almalinux/kernel-rt-64k-modules-corepkg:rpm/almalinux/kernel-rt-64k-modules-extrapkg:rpm/almalinux/kernel-rt-corepkg:rpm/almalinux/kernel-rt-debugpkg:rpm/almalinux/kernel-rt-debug-corepkg:rpm/almalinux/kernel-rt-debug-develpkg:rpm/almalinux/kernel-rt-debug-modulespkg:rpm/almalinux/kernel-rt-debug-modules-corepkg:rpm/almalinux/kernel-rt-debug-modules-extrapkg:rpm/almalinux/kernel-rt-develpkg:rpm/almalinux/kernel-rt-modulespkg:rpm/almalinux/kernel-rt-modules-corepkg:rpm/almalinux/kernel-rt-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/kernel-uki-virtpkg:rpm/almalinux/kernel-uki-virt-addonspkg:rpm/almalinux/kernel-zfcpdumppkg:rpm/almalinux/kernel-zfcpdump-corepkg:rpm/almalinux/kernel-zfcpdump-develpkg:rpm/almalinux/kernel-zfcpdump-devel-matchedpkg:rpm/almalinux/kernel-zfcpdump-modulespkg:rpm/almalinux/kernel-zfcpdump-modules-corepkg:rpm/almalinux/kernel-zfcpdump-modules-extrapkg:rpm/almalinux/libperfpkg:rpm/almalinux/perfpkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/rtlapkg:rpm/almalinux/rvpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_84&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5
< 4.18.0-553.126.1.el8_10+ 83 more
- (no CPE)range: < 4.18.0-553.126.1.el8_10
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 6.12.0-211.18.1.el10_2
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 4.12.14-122.317.1
- (no CPE)range: < 1-8.7.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789dnvdPatch
- git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64nvdPatch
- git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009nvdPatch
- git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257nvdPatch
- git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6nvdPatch
- git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15nvdPatch
- git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564cenvdPatch
- git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52cnvdPatch
News mentions
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