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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.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-01 | Updated 2026-05-01 | Assigner Linux

Product status

Default status
unaffected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before 0f37d1e65c6d71ad94ccfb5c602163c525db789d
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before 257cdb960d8ff6d60bb6461b03c814b6cf0c9e64
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before c34577f517b556fb6ca173d45bf7e766ae2564ce
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before f71695e81f4cb428f3c7e2138eae88199005b52c
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before 82f342b3b006ca1d65f4890c05f2ec32fcb808b6
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before 50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before 40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009
affected

346af67b8d116f01ef696fd47959a55deb2db8b6 (git) before b8dbe9648d69059cfe3a28917bfbf7e61efd7f15
affected

Default status
affected

3.4
affected

Any version before 3.4
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.168 (semver)
unaffected

6.6.134 (semver)
unaffected

6.12.81 (semver)
unaffected

6.18.22 (semver)
unaffected

6.19.12 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/0f37d1e65c6d71ad94ccfb5c602163c525db789d

git.kernel.org/...c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64

git.kernel.org/...c/c34577f517b556fb6ca173d45bf7e766ae2564ce

git.kernel.org/...c/f71695e81f4cb428f3c7e2138eae88199005b52c

git.kernel.org/...c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6

git.kernel.org/...c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257

git.kernel.org/...c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009

git.kernel.org/...c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15

cve.org (CVE-2026-43020)

nvd.nist.gov (CVE-2026-43020)

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