| 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-2021-47520: can: pch_can: pch_can_rx_normal: fix use after free |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| can: pch_can: pch_can_rx_normal: fix use after free |
| |
| After calling netif_receive_skb(skb), dereferencing skb is unsafe. |
| Especially, the can_frame cf which aliases skb memory is dereferenced |
| just after the call netif_receive_skb(skb). |
| |
| Reordering the lines solves the issue. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47520 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 4.4.295 with commit bafe343a885c70dddf358379cf0b2a1c07355d8d |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 4.9.293 with commit 3a3c46e2eff0577454860a203be1a8295f4acb76 |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 4.14.258 with commit affbad02bf80380a7403885b9fe4a1587d1bb4f3 |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 4.19.221 with commit 3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 5.4.165 with commit abb4eff3dcd2e583060082a18a8dbf31f02689d4 |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 5.10.85 with commit 703dde112021c93d6e89443c070e7dbd4dea612e |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 5.15.8 with commit 6c73fc931658d8cbc8a1714b326cb31eb71d16a7 |
| Issue introduced in 2.6.37 with commit b21d18b51b31a24d17f883b678432fbdee3d5675 and fixed in 5.16 with commit 94cddf1e9227a171b27292509d59691819c458db |
| |
| 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-2021-47520 |
| 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/can/pch_can.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/bafe343a885c70dddf358379cf0b2a1c07355d8d |
| https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76 |
| https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3 |
| https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa |
| https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4 |
| https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e |
| https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7 |
| https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db |
