| 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-2024-49864: rxrpc: Fix a race between socket set up and I/O thread creation |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| rxrpc: Fix a race between socket set up and I/O thread creation |
| |
| In rxrpc_open_socket(), it sets up the socket and then sets up the I/O |
| thread that will handle it. This is a problem, however, as there's a gap |
| between the two phases in which a packet may come into rxrpc_encap_rcv() |
| from the UDP packet but we oops when trying to wake the not-yet created I/O |
| thread. |
| |
| As a quick fix, just make rxrpc_encap_rcv() discard the packet if there's |
| no I/O thread yet. |
| |
| A better, but more intrusive fix would perhaps be to rearrange things such |
| that the socket creation is done by the I/O thread. |
| |
| The Linux kernel CVE team has assigned CVE-2024-49864 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.2 with commit a275da62e8c111b897b9cb73eb91df2f4e475ca5 and fixed in 6.6.55 with commit cdf4bbbdb956d7426f687f38757ebca2a2759a0f |
| Issue introduced in 6.2 with commit a275da62e8c111b897b9cb73eb91df2f4e475ca5 and fixed in 6.10.14 with commit 56e415202b8a17de6496f4023e545fcb66f118ec |
| Issue introduced in 6.2 with commit a275da62e8c111b897b9cb73eb91df2f4e475ca5 and fixed in 6.11.3 with commit c64f5fc95e9612fdf75587c8e21e494e614c18e2 |
| Issue introduced in 6.2 with commit a275da62e8c111b897b9cb73eb91df2f4e475ca5 and fixed in 6.12 with commit bc212465326e8587325f520a052346f0b57360e6 |
| |
| 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-2024-49864 |
| 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: |
| net/rxrpc/ar-internal.h |
| net/rxrpc/io_thread.c |
| net/rxrpc/local_object.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/cdf4bbbdb956d7426f687f38757ebca2a2759a0f |
| https://git.kernel.org/stable/c/56e415202b8a17de6496f4023e545fcb66f118ec |
| https://git.kernel.org/stable/c/c64f5fc95e9612fdf75587c8e21e494e614c18e2 |
| https://git.kernel.org/stable/c/bc212465326e8587325f520a052346f0b57360e6 |
