| 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-2021-47355: atm: nicstar: Fix possible use-after-free in nicstar_cleanup() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| atm: nicstar: Fix possible use-after-free in nicstar_cleanup() |
| |
| 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-2021-47355 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.276 with commit 99779c9d9ffc7775da6f7fd8a7c93ac61657bed5 |
| Fixed in 4.9.276 with commit 4e2a0848ea2cab0716d46f85a8ccd5fa9a493e51 |
| Fixed in 4.14.240 with commit c471569632654e57c83512e0fc1ba0dbb4544ad6 |
| Fixed in 4.19.198 with commit a7a7b2848312cc4c3a42b6e42a8ab2e441857aba |
| Fixed in 5.4.133 with commit bdf5334250c69fabf555b7322c75249ea7d5f148 |
| Fixed in 5.10.51 with commit a7f7c42e31157d1f0871d6a8e1a0b73a6b4ea785 |
| Fixed in 5.12.18 with commit 2f958b6f6ba0854b39be748d21dfe71e0fe6580f |
| Fixed in 5.13.3 with commit 5b991df8881088448cb223e769e37cab8dd40706 |
| Fixed in 5.14 with commit 34e7434ba4e97f4b85c1423a59b2922ba7dff2ea |
| |
| 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-2021-47355 |
| 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/nicstar.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/99779c9d9ffc7775da6f7fd8a7c93ac61657bed5 |
| https://git.kernel.org/stable/c/4e2a0848ea2cab0716d46f85a8ccd5fa9a493e51 |
| https://git.kernel.org/stable/c/c471569632654e57c83512e0fc1ba0dbb4544ad6 |
| https://git.kernel.org/stable/c/a7a7b2848312cc4c3a42b6e42a8ab2e441857aba |
| https://git.kernel.org/stable/c/bdf5334250c69fabf555b7322c75249ea7d5f148 |
| https://git.kernel.org/stable/c/a7f7c42e31157d1f0871d6a8e1a0b73a6b4ea785 |
| https://git.kernel.org/stable/c/2f958b6f6ba0854b39be748d21dfe71e0fe6580f |
| https://git.kernel.org/stable/c/5b991df8881088448cb223e769e37cab8dd40706 |
| https://git.kernel.org/stable/c/34e7434ba4e97f4b85c1423a59b2922ba7dff2ea |
