| 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-2024-35880: io_uring/kbuf: hold io_buffer_list reference over mmap |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| io_uring/kbuf: hold io_buffer_list reference over mmap |
| |
| If we look up the kbuf, ensure that it doesn't get unregistered until |
| after we're done with it. Since we're inside mmap, we cannot safely use |
| the io_uring lock. Rely on the fact that we can lookup the buffer list |
| under RCU now and grab a reference to it, preventing it from being |
| unregistered until we're done with it. The lookup returns the |
| io_buffer_list directly with it referenced. |
| |
| The Linux kernel CVE team has assigned CVE-2024-35880 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6.5 with commit 09f7520048eaaee9709091cd2787966f807da7c5 and fixed in 6.6.26 with commit 65938e81df2197203bda4b9a0c477e7987218d66 |
| Issue introduced in 6.7 with commit 5cf4f52e6d8aa2d3b7728f568abbf9d42a3af252 and fixed in 6.8.5 with commit 5fd8e2359498043e0b5329a05f02d10a9eb91eb9 |
| Issue introduced in 6.7 with commit 5cf4f52e6d8aa2d3b7728f568abbf9d42a3af252 and fixed in 6.9 with commit 561e4f9451d65fc2f7eef564e0064373e3019793 |
| |
| 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-2024-35880 |
| 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 |
| io_uring/kbuf.c |
| io_uring/kbuf.h |
| |
| |
| 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/65938e81df2197203bda4b9a0c477e7987218d66 |
| https://git.kernel.org/stable/c/5fd8e2359498043e0b5329a05f02d10a9eb91eb9 |
| https://git.kernel.org/stable/c/561e4f9451d65fc2f7eef564e0064373e3019793 |
