| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49798: tracing: Fix race where eprobes can be called before the event |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| tracing: Fix race where eprobes can be called before the event |
| |
| The flag that tells the event to call its triggers after reading the event |
| is set for eprobes after the eprobe is enabled. This leads to a race where |
| the eprobe may be triggered at the beginning of the event where the record |
| information is NULL. The eprobe then dereferences the NULL record causing |
| a NULL kernel pointer bug. |
| |
| Test for a NULL record to keep this from happening. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49798 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 7491e2c442781a1860181adb5ab472a52075f393 and fixed in 5.15.80 with commit 7291dec4f2d17a2d3fd1f789fb41e58476539f21 |
| Issue introduced in 5.15 with commit 7491e2c442781a1860181adb5ab472a52075f393 and fixed in 6.0.10 with commit 73f5191467ffe3af82f27fe0ea6a8c2fac724d3f |
| Issue introduced in 5.15 with commit 7491e2c442781a1860181adb5ab472a52075f393 and fixed in 6.1 with commit 94eedf3dded5fb472ce97bfaf3ac1c6c29c35d26 |
| |
| 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-2022-49798 |
| 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: |
| kernel/trace/trace_eprobe.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/7291dec4f2d17a2d3fd1f789fb41e58476539f21 |
| https://git.kernel.org/stable/c/73f5191467ffe3af82f27fe0ea6a8c2fac724d3f |
| https://git.kernel.org/stable/c/94eedf3dded5fb472ce97bfaf3ac1c6c29c35d26 |
