| 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-2024-50227: thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan() |
| |
| KASAN reported following issue: |
| |
| BUG: KASAN: stack-out-of-bounds in tb_retimer_scan+0xffe/0x1550 [thunderbolt] |
| Read of size 4 at addr ffff88810111fc1c by task kworker/u56:0/11 |
| CPU: 0 UID: 0 PID: 11 Comm: kworker/u56:0 Tainted: G U 6.11.0+ #1387 |
| Tainted: [U]=USER |
| Workqueue: thunderbolt0 tb_handle_hotplug [thunderbolt] |
| Call Trace: |
| <TASK> |
| dump_stack_lvl+0x6c/0x90 |
| print_report+0xd1/0x630 |
| kasan_report+0xdb/0x110 |
| __asan_report_load4_noabort+0x14/0x20 |
| tb_retimer_scan+0xffe/0x1550 [thunderbolt] |
| tb_scan_port+0xa6f/0x2060 [thunderbolt] |
| tb_handle_hotplug+0x17b1/0x3080 [thunderbolt] |
| process_one_work+0x626/0x1100 |
| worker_thread+0x6c8/0xfa0 |
| kthread+0x2c8/0x3a0 |
| ret_from_fork+0x3a/0x80 |
| ret_from_fork_asm+0x1a/0x30 |
| |
| This happens because the loop variable still gets incremented by one so |
| max becomes 3 instead of 2, and this makes the second loop read past the |
| the array declared on the stack. |
| |
| Fix this by assigning to max directly in the loop body. |
| |
| The Linux kernel CVE team has assigned CVE-2024-50227 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit ff6ab055e070d819f51196622e08f8941b6d2a4b and fixed in 6.11.7 with commit 08b2771e9270fbe1ed4fbbe93abe05ac7fe9861d |
| Issue introduced in 6.11 with commit ff6ab055e070d819f51196622e08f8941b6d2a4b and fixed in 6.12 with commit e9e1b20fae7de06ba36dd3f8dba858157bad233d |
| |
| 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-2024-50227 |
| 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/thunderbolt/retimer.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/08b2771e9270fbe1ed4fbbe93abe05ac7fe9861d |
| https://git.kernel.org/stable/c/e9e1b20fae7de06ba36dd3f8dba858157bad233d |
