| 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-2021-47240: net: qrtr: fix OOB Read in qrtr_endpoint_post |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: qrtr: fix OOB Read in qrtr_endpoint_post |
| |
| Syzbot reported slab-out-of-bounds Read in |
| qrtr_endpoint_post. The problem was in wrong |
| _size_ type: |
| |
| if (len != ALIGN(size, 4) + hdrlen) |
| goto err; |
| |
| If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of |
| ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 |
| in header this check won't fail and |
| |
| skb_put_data(skb, data + hdrlen, size); |
| |
| will read out of bound from data, which is hdrlen allocated block. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47240 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.15 with commit 194ccc88297ae78d0803adad83c6dcc369787c9e and fixed in 4.19.196 with commit f8111c0d7ed42ede41a3d0d393b104de0730a8a6 |
| Issue introduced in 4.15 with commit 194ccc88297ae78d0803adad83c6dcc369787c9e and fixed in 5.4.128 with commit 26b8d10703a9be45d6097946b2b4011f7dd2c56f |
| Issue introduced in 4.15 with commit 194ccc88297ae78d0803adad83c6dcc369787c9e and fixed in 5.10.46 with commit 960b08dd36de1e341e3eb43d1c547513e338f4f8 |
| Issue introduced in 4.15 with commit 194ccc88297ae78d0803adad83c6dcc369787c9e and fixed in 5.12.13 with commit 19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe |
| Issue introduced in 4.15 with commit 194ccc88297ae78d0803adad83c6dcc369787c9e and fixed in 5.13 with commit ad9d24c9429e2159d1e279dc3a83191ccb4daf1d |
| |
| 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-2021-47240 |
| 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/qrtr/qrtr.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/f8111c0d7ed42ede41a3d0d393b104de0730a8a6 |
| https://git.kernel.org/stable/c/26b8d10703a9be45d6097946b2b4011f7dd2c56f |
| https://git.kernel.org/stable/c/960b08dd36de1e341e3eb43d1c547513e338f4f8 |
| https://git.kernel.org/stable/c/19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe |
| https://git.kernel.org/stable/c/ad9d24c9429e2159d1e279dc3a83191ccb4daf1d |
