| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-42255: tpm: Use auth only after NULL check in tpm_buf_check_hmac_response() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| tpm: Use auth only after NULL check in tpm_buf_check_hmac_response() |
| |
| Dereference auth after NULL check in tpm_buf_check_hmac_response(). |
| Otherwise, unless tpm2_sessions_init() was called, a call can cause NULL |
| dereference, when TCG_TPM2_HMAC is enabled. |
| |
| [jarkko: adjusted the commit message.] |
| |
| The Linux kernel CVE team has assigned CVE-2024-42255 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10 with commit 7ca110f2679b7d1f3ac1afc90e6ffbf0af3edf0d and fixed in 6.10.1 with commit b9afbb9a0c734197c59c43610071041044bf1562 |
| Issue introduced in 6.10 with commit 7ca110f2679b7d1f3ac1afc90e6ffbf0af3edf0d and fixed in 6.11 with commit 7dc357d343f134bf59815ff6098b93503ec8a23b |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-42255 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/char/tpm/tpm2-sessions.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/b9afbb9a0c734197c59c43610071041044bf1562 |
| https://git.kernel.org/stable/c/7dc357d343f134bf59815ff6098b93503ec8a23b |
