| 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-2024-36477: tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer |
| |
| The TPM SPI transfer mechanism uses MAX_SPI_FRAMESIZE for computing the |
| maximum transfer length and the size of the transfer buffer. As such, it |
| does not account for the 4 bytes of header that prepends the SPI data |
| frame. This can result in out-of-bounds accesses and was confirmed with |
| KASAN. |
| |
| Introduce SPI_HDRSIZE to account for the header and use to allocate the |
| transfer buffer. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36477 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit a86a42ac2bd652fdc7836a9d880c306a2485c142 and fixed in 6.6.33 with commit 1547183852dcdfcc25878db7dd3620509217b0cd |
| Issue introduced in 6.6 with commit a86a42ac2bd652fdc7836a9d880c306a2485c142 and fixed in 6.9.4 with commit de13c56f99477b56980c7e00b09c776d16b7563d |
| Issue introduced in 6.6 with commit a86a42ac2bd652fdc7836a9d880c306a2485c142 and fixed in 6.10 with commit 195aba96b854dd664768f382cd1db375d8181f88 |
| |
| 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-2024-36477 |
| 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/tpm_tis_spi_main.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/1547183852dcdfcc25878db7dd3620509217b0cd |
| https://git.kernel.org/stable/c/de13c56f99477b56980c7e00b09c776d16b7563d |
| https://git.kernel.org/stable/c/195aba96b854dd664768f382cd1db375d8181f88 |
