| 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-2021-47600: dm btree remove: fix use after free in rebalance_children() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dm btree remove: fix use after free in rebalance_children() |
| |
| Move dm_tm_unlock() after dm_tm_dec(). |
| |
| The Linux kernel CVE team has assigned CVE-2021-47600 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.296 with commit a48f6a2bf33734ec5669ee03067dfb6c5b4818d6 |
| Fixed in 4.9.294 with commit 66ea642af6fd4eacb5d0271a922130fcf8700424 |
| Fixed in 4.14.259 with commit b03abd0aa09c05099f537cb05b8460c4298f0861 |
| Fixed in 4.19.222 with commit 293f957be5e39720778fb1851ced7f5fba6d51c3 |
| Fixed in 5.4.168 with commit 501ecd90efdc9b2edc6c28852ecd098a4adf8f00 |
| Fixed in 5.10.88 with commit 0e21e6cd5eebfc929ac5fa3b97ca2d4ace3cb6a3 |
| Fixed in 5.15.11 with commit 607beb420b3fe23b948a9bf447d993521a02fbbb |
| Fixed in 5.16 with commit 1b8d2789dad0005fd5e7d35dab26a8e1203fb6da |
| |
| 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-2021-47600 |
| 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/md/persistent-data/dm-btree-remove.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/a48f6a2bf33734ec5669ee03067dfb6c5b4818d6 |
| https://git.kernel.org/stable/c/66ea642af6fd4eacb5d0271a922130fcf8700424 |
| https://git.kernel.org/stable/c/b03abd0aa09c05099f537cb05b8460c4298f0861 |
| https://git.kernel.org/stable/c/293f957be5e39720778fb1851ced7f5fba6d51c3 |
| https://git.kernel.org/stable/c/501ecd90efdc9b2edc6c28852ecd098a4adf8f00 |
| https://git.kernel.org/stable/c/0e21e6cd5eebfc929ac5fa3b97ca2d4ace3cb6a3 |
| https://git.kernel.org/stable/c/607beb420b3fe23b948a9bf447d993521a02fbbb |
| https://git.kernel.org/stable/c/1b8d2789dad0005fd5e7d35dab26a8e1203fb6da |
