| 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-2022-48816: SUNRPC: lock against ->sock changing during sysfs read |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| SUNRPC: lock against ->sock changing during sysfs read |
| |
| ->sock can be set to NULL asynchronously unless ->recv_mutex is held. |
| So it is important to hold that mutex. Otherwise a sysfs read can |
| trigger an oops. |
| Commit 17f09d3f619a ("SUNRPC: Check if the xprt is connected before |
| handling sysfs reads") appears to attempt to fix this problem, but it |
| only narrows the race window. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48816 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit a8482488a7d6d320f63a9ee1912dbb5ae5b80a61 and fixed in 5.16.10 with commit 9482ab4540f5bcc869b44c067ae99b5fca16bd07 |
| Issue introduced in 5.14 with commit a8482488a7d6d320f63a9ee1912dbb5ae5b80a61 and fixed in 5.17 with commit b49ea673e119f59c71645e2f65b3ccad857c90ee |
| Issue introduced in 5.10.67 with commit 21a2be1a5145d072deedc7cdc5b2d17380abea75 |
| Issue introduced in 5.13.19 with commit 77876473912d1bf1ed16bffa1674e5ff0f499f25 |
| |
| 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-2022-48816 |
| 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/sunrpc/sysfs.c |
| net/sunrpc/xprtsock.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/9482ab4540f5bcc869b44c067ae99b5fca16bd07 |
| https://git.kernel.org/stable/c/b49ea673e119f59c71645e2f65b3ccad857c90ee |
