CVE-2026-43020
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedMay 1, 2026
First seenMay 1, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- linux linux_kernel5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 or later
Patches
- git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d
- git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64
- git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009
- git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257
- git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6
- git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15
- git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce
- git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.4 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.168, 6.2 ≤ v < 6.6.134, 6.7 ≤ v < 6.12.81, 6.13 ≤ v < 6.18.22, 6.19 ≤ v < 6.19.12, 7.0 | 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 |
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