| 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-2021-47058: regmap: set debugfs_name to NULL after it is freed |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| regmap: set debugfs_name to NULL after it is freed |
| |
| There is a upstream commit cffa4b2122f5("regmap:debugfs: |
| Fix a memory leak when calling regmap_attach_dev") that |
| adds a if condition when create name for debugfs_name. |
| With below function invoking logical, debugfs_name is |
| freed in regmap_debugfs_exit(), but it is not created again |
| because of the if condition introduced by above commit. |
| regmap_reinit_cache() |
| regmap_debugfs_exit() |
| ... |
| regmap_debugfs_init() |
| So, set debugfs_name to NULL after it is freed. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47058 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19.168 with commit 5b654b03007917f3f1015b2a5c288c1ea6ae8f65 and fixed in 4.19.191 with commit 2dc1554d5f0fdaf47cc5bea442b84b9226fea867 |
| Issue introduced in 5.4.90 with commit 480c5e9c7e4c76c01d5f1f7b73832d7b77e6b427 and fixed in 5.4.119 with commit d8897f7b2283a500666c85ef06e820df38ed7b52 |
| Issue introduced in 5.10.8 with commit c9698380b01aed3281160d3ab25749b57d6913b8 and fixed in 5.10.37 with commit eb949f891226c012138ffd9df90d1e509f428ae6 |
| Issue introduced in 5.11 with commit cffa4b2122f5f3e53cf3d529bbc74651f95856d5 and fixed in 5.11.21 with commit c764e375ae647832de1ee73d43a4bb3ef8a8f43d |
| Issue introduced in 5.11 with commit cffa4b2122f5f3e53cf3d529bbc74651f95856d5 and fixed in 5.12.4 with commit b9e569ae1da3a113b3acee8703c94777fd20938a |
| Issue introduced in 5.11 with commit cffa4b2122f5f3e53cf3d529bbc74651f95856d5 and fixed in 5.13 with commit e41a962f82e7afb5b1ee644f48ad0b3aee656268 |
| |
| 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-2021-47058 |
| 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: |
| drivers/base/regmap/regmap-debugfs.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/2dc1554d5f0fdaf47cc5bea442b84b9226fea867 |
| https://git.kernel.org/stable/c/d8897f7b2283a500666c85ef06e820df38ed7b52 |
| https://git.kernel.org/stable/c/eb949f891226c012138ffd9df90d1e509f428ae6 |
| https://git.kernel.org/stable/c/c764e375ae647832de1ee73d43a4bb3ef8a8f43d |
| https://git.kernel.org/stable/c/b9e569ae1da3a113b3acee8703c94777fd20938a |
| https://git.kernel.org/stable/c/e41a962f82e7afb5b1ee644f48ad0b3aee656268 |
