| 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-2024-58000: io_uring: prevent reg-wait speculations |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| io_uring: prevent reg-wait speculations |
| |
| With *ENTER_EXT_ARG_REG instead of passing a user pointer with arguments |
| for the waiting loop the user can specify an offset into a pre-mapped |
| region of memory, in which case the |
| [offset, offset + sizeof(io_uring_reg_wait)) will be intepreted as the |
| argument. |
| |
| As we address a kernel array using a user given index, it'd be a subject |
| to speculation type of exploits. Use array_index_nospec() to prevent |
| that. Make sure to pass not the full region size but truncate by the |
| maximum offset allowed considering the structure size. |
| |
| The Linux kernel CVE team has assigned CVE-2024-58000 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.13 with commit aa00f67adc2c0d6439f81b5a81ff181377c47a7e and fixed in 6.13.2 with commit 2a6de94df7bfa76d9850443547e7b3333f63a16a |
| Issue introduced in 6.13 with commit aa00f67adc2c0d6439f81b5a81ff181377c47a7e and fixed in 6.14 with commit 29b95ac917927ce9f95bf38797e16333ecb489b1 |
| |
| 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-2024-58000 |
| 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/io_uring.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/2a6de94df7bfa76d9850443547e7b3333f63a16a |
| https://git.kernel.org/stable/c/29b95ac917927ce9f95bf38797e16333ecb489b1 |
