| 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-2021-47357: atm: iphase: fix possible use-after-free in ia_module_exit() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| atm: iphase: fix possible use-after-free in ia_module_exit() |
| |
| This module's remove path calls del_timer(). However, that function |
| does not wait until the timer handler finishes. This means that the |
| timer handler may still be running after the driver's remove function |
| has finished, which would result in a use-after-free. |
| |
| Fix by calling del_timer_sync(), which makes sure the timer handler |
| has finished, and unable to re-schedule itself. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47357 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.276 with commit 9e161687855175334ca93c6c3ccb221731194479 |
| Fixed in 4.9.276 with commit a832ee2f2145f57443b2d565f8cb5490e8339f42 |
| Fixed in 4.14.240 with commit bcdd2be48edd8c6867fb44112cb8d18086beae29 |
| Fixed in 4.19.198 with commit 89ce0b0747f319eb70f85bc820dcc43cebbd5417 |
| Fixed in 5.4.133 with commit c9172498d4d62c9b64e5fb37c1ee0343e65fe51b |
| Fixed in 5.10.51 with commit e759ff76ebbbfcdcf83b6634c54dc47828573d8b |
| Fixed in 5.12.18 with commit b58d246a058ae88484758cd4ab27b3180fd5ecf8 |
| Fixed in 5.13.3 with commit d1fb12412874c94ad037e11d0ecdd1140a439297 |
| Fixed in 5.14 with commit 1c72e6ab66b9598cac741ed397438a52065a8f1f |
| |
| 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-2021-47357 |
| 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/atm/iphase.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/9e161687855175334ca93c6c3ccb221731194479 |
| https://git.kernel.org/stable/c/a832ee2f2145f57443b2d565f8cb5490e8339f42 |
| https://git.kernel.org/stable/c/bcdd2be48edd8c6867fb44112cb8d18086beae29 |
| https://git.kernel.org/stable/c/89ce0b0747f319eb70f85bc820dcc43cebbd5417 |
| https://git.kernel.org/stable/c/c9172498d4d62c9b64e5fb37c1ee0343e65fe51b |
| https://git.kernel.org/stable/c/e759ff76ebbbfcdcf83b6634c54dc47828573d8b |
| https://git.kernel.org/stable/c/b58d246a058ae88484758cd4ab27b3180fd5ecf8 |
| https://git.kernel.org/stable/c/d1fb12412874c94ad037e11d0ecdd1140a439297 |
| https://git.kernel.org/stable/c/1c72e6ab66b9598cac741ed397438a52065a8f1f |
