| 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-2024-42108: net: rswitch: Avoid use-after-free in rswitch_poll() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: rswitch: Avoid use-after-free in rswitch_poll() |
| |
| The use-after-free is actually in rswitch_tx_free(), which is inlined in |
| rswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the |
| same pointer, the skb is first freed using dev_kfree_skb_any(), then the |
| value in skb->len is used to update the interface statistics. |
| |
| Let's move around the instructions to use skb->len before the skb is |
| freed. |
| |
| This bug is trivial to reproduce using KFENCE. It will trigger a splat |
| every few packets. A simple ARP request or ICMP echo request is enough. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42108 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 271e015b91535dd87fd0f5df0cc3b906c2eddef9 and fixed in 6.9.9 with commit 92cbbe7759193e3418f38d0d73f8fe125312c58b |
| Issue introduced in 6.8 with commit 271e015b91535dd87fd0f5df0cc3b906c2eddef9 and fixed in 6.10 with commit 9a0c28efeec6383ef22e97437616b920e7320b67 |
| |
| 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-2024-42108 |
| 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/renesas/rswitch.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/4a41bb9f2b402469d425a1c13359d3b3ea4e6403 |
| https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b |
| https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67 |
