| 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-2022-49641: sysctl: Fix data races in proc_douintvec(). |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sysctl: Fix data races in proc_douintvec(). |
| |
| A sysctl variable is accessed concurrently, and there is always a chance |
| of data-race. So, all readers and writers need some basic protection to |
| avoid load/store-tearing. |
| |
| This patch changes proc_douintvec() to use READ_ONCE() and WRITE_ONCE() |
| internally to fix data-races on the sysctl side. For now, proc_douintvec() |
| itself is tolerant to a data-race, but we still need to add annotations on |
| the other subsystem's side. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49641 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.8 with commit e7d316a02f683864a12389f8808570e37fb90aa3 and fixed in 5.10.132 with commit d5d54714e329f646bd7af4994fc427d88ee68936 |
| Issue introduced in 4.8 with commit e7d316a02f683864a12389f8808570e37fb90aa3 and fixed in 5.15.56 with commit d335db59f7fb3353f56e52371f1ee796ae9c8f09 |
| Issue introduced in 4.8 with commit e7d316a02f683864a12389f8808570e37fb90aa3 and fixed in 5.18.13 with commit 630c76850d554d7140232e71b5d1663e88cffb54 |
| Issue introduced in 4.8 with commit e7d316a02f683864a12389f8808570e37fb90aa3 and fixed in 5.19 with commit 4762b532ec9539755aab61445d5da6e1926ccb99 |
| Issue introduced in 4.4.24 with commit 70cd763eb1574cac07138be91f474a661e02d694 |
| Issue introduced in 4.7.7 with commit f4cea51e9a3d536e2ca2b74a958f7c0b4ea733c3 |
| |
| 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-2022-49641 |
| 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/sysctl.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/d5d54714e329f646bd7af4994fc427d88ee68936 |
| https://git.kernel.org/stable/c/d335db59f7fb3353f56e52371f1ee796ae9c8f09 |
| https://git.kernel.org/stable/c/630c76850d554d7140232e71b5d1663e88cffb54 |
| https://git.kernel.org/stable/c/4762b532ec9539755aab61445d5da6e1926ccb99 |
