| 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-2024-42254: io_uring: fix error pbuf checking |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| io_uring: fix error pbuf checking |
| |
| Syz reports a problem, which boils down to NULL vs IS_ERR inconsistent |
| error handling in io_alloc_pbuf_ring(). |
| |
| KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] |
| RIP: 0010:__io_remove_buffers+0xac/0x700 io_uring/kbuf.c:341 |
| Call Trace: |
| <TASK> |
| io_put_bl io_uring/kbuf.c:378 [inline] |
| io_destroy_buffers+0x14e/0x490 io_uring/kbuf.c:392 |
| io_ring_ctx_free+0xa00/0x1070 io_uring/io_uring.c:2613 |
| io_ring_exit_work+0x80f/0x8a0 io_uring/io_uring.c:2844 |
| process_one_work kernel/workqueue.c:3231 [inline] |
| process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 |
| worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 |
| kthread+0x2f0/0x390 kernel/kthread.c:389 |
| ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 |
| ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 |
| |
| The Linux kernel CVE team has assigned CVE-2024-42254 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10 with commit 87585b05757dc70545efb434669708d276125559 and fixed in 6.10.1 with commit 68d19af95a353f5e2b021602180b65b303eba99d |
| Issue introduced in 6.10 with commit 87585b05757dc70545efb434669708d276125559 and fixed in 6.11 with commit bcc87d978b834c298bbdd9c52454c5d0a946e97e |
| |
| 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-2024-42254 |
| 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: |
| io_uring/kbuf.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/78aefac7efdffddf7889405b7c08e6e0f030fa35 |
| https://git.kernel.org/stable/c/68d19af95a353f5e2b021602180b65b303eba99d |
| https://git.kernel.org/stable/c/bcc87d978b834c298bbdd9c52454c5d0a946e97e |
