| 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-2024-47708: netkit: Assign missing bpf_net_context |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netkit: Assign missing bpf_net_context |
| |
| During the introduction of struct bpf_net_context handling for |
| XDP-redirect, the netkit driver has been missed, which also requires it |
| because NETKIT_REDIRECT invokes skb_do_redirect() which is accessing the |
| per-CPU variables. Otherwise we see the following crash: |
| |
| BUG: kernel NULL pointer dereference, address: 0000000000000038 |
| bpf_redirect() |
| netkit_xmit() |
| dev_hard_start_xmit() |
| |
| Set the bpf_net_context before invoking netkit_xmit() program within the |
| netkit driver. |
| |
| The Linux kernel CVE team has assigned CVE-2024-47708 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit 401cb7dae8130fd34eb84648e02ab4c506df7d5e and fixed in 6.11.2 with commit 182c6fed8c7f62cddce0126ec1fc0da2b700fb11 |
| Issue introduced in 6.11 with commit 401cb7dae8130fd34eb84648e02ab4c506df7d5e and fixed in 6.12 with commit 157f29152b61ca41809dd7ead29f5733adeced19 |
| |
| 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-2024-47708 |
| 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/netkit.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/182c6fed8c7f62cddce0126ec1fc0da2b700fb11 |
| https://git.kernel.org/stable/c/157f29152b61ca41809dd7ead29f5733adeced19 |
