| 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-2021-47252: batman-adv: Avoid WARN_ON timing related checks |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| batman-adv: Avoid WARN_ON timing related checks |
| |
| The soft/batadv interface for a queued OGM can be changed during the time |
| the OGM was queued for transmission and when the OGM is actually |
| transmitted by the worker. |
| |
| But WARN_ON must be used to denote kernel bugs and not to print simple |
| warnings. A warning can simply be printed using pr_warn. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47252 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 4.4.293 with commit 45011f2973f6b52cf50db397bb27bf805f5f0e7f |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 4.9.274 with commit 6031daaaf6d5c359c99dfffa102e332df234ff09 |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 4.14.238 with commit 77a99aad5bc3ea105806ebae6be3cbadc2fc615e |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 4.19.196 with commit e8e9d2968a9d08bf5c683afca182f1537edebf8d |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 5.4.128 with commit e7fbd8184fa9e85f0d648c499841cb7ff6dec9f4 |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 5.10.46 with commit 282baa8104af44e04c4af3e7f933b44267c7f86f |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 5.12.13 with commit 2eb4e0b3631832a4291c8bf4c9db873f60b128c8 |
| Issue introduced in 3.14 with commit ef0a937f7a1450d3a133ccd83c9c7d07587e7a00 and fixed in 5.13 with commit 9f460ae31c4435fd022c443a6029352217a16ac1 |
| |
| 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-2021-47252 |
| 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: |
| net/batman-adv/bat_iv_ogm.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/45011f2973f6b52cf50db397bb27bf805f5f0e7f |
| https://git.kernel.org/stable/c/6031daaaf6d5c359c99dfffa102e332df234ff09 |
| https://git.kernel.org/stable/c/77a99aad5bc3ea105806ebae6be3cbadc2fc615e |
| https://git.kernel.org/stable/c/e8e9d2968a9d08bf5c683afca182f1537edebf8d |
| https://git.kernel.org/stable/c/e7fbd8184fa9e85f0d648c499841cb7ff6dec9f4 |
| https://git.kernel.org/stable/c/282baa8104af44e04c4af3e7f933b44267c7f86f |
| https://git.kernel.org/stable/c/2eb4e0b3631832a4291c8bf4c9db873f60b128c8 |
| https://git.kernel.org/stable/c/9f460ae31c4435fd022c443a6029352217a16ac1 |
