| 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-2021-47105: ice: xsk: return xsk buffers back to pool when cleaning the ring |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ice: xsk: return xsk buffers back to pool when cleaning the ring |
| |
| Currently we only NULL the xdp_buff pointer in the internal SW ring but |
| we never give it back to the xsk buffer pool. This means that buffers |
| can be leaked out of the buff pool and never be used again. |
| |
| Add missing xsk_buff_free() call to the routine that is supposed to |
| clean the entries that are left in the ring so that these buffers in the |
| umem can be used by other sockets. |
| |
| Also, only go through the space that is actually left to be cleaned |
| instead of a whole ring. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47105 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.5 with commit 2d4238f5569722197612656163d824098208519c and fixed in 5.15.12 with commit ad6d20da2cfbe14b7b1200d15f39e65988b0b9e8 |
| Issue introduced in 5.5 with commit 2d4238f5569722197612656163d824098208519c and fixed in 5.16 with commit afe8a3ba85ec2a6b6849367e25c06a2f8e0ddd05 |
| |
| 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-2021-47105 |
| 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/net/ethernet/intel/ice/ice_xsk.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/ad6d20da2cfbe14b7b1200d15f39e65988b0b9e8 |
| https://git.kernel.org/stable/c/afe8a3ba85ec2a6b6849367e25c06a2f8e0ddd05 |
