| 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-2024-44996: vsock: fix recursive ->recvmsg calls |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| vsock: fix recursive ->recvmsg calls |
| |
| After a vsock socket has been added to a BPF sockmap, its prot->recvmsg |
| has been replaced with vsock_bpf_recvmsg(). Thus the following |
| recursiion could happen: |
| |
| vsock_bpf_recvmsg() |
| -> __vsock_recvmsg() |
| -> vsock_connectible_recvmsg() |
| -> prot->recvmsg() |
| -> vsock_bpf_recvmsg() again |
| |
| We need to fix it by calling the original ->recvmsg() without any BPF |
| sockmap logic in __vsock_recvmsg(). |
| |
| The Linux kernel CVE team has assigned CVE-2024-44996 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.4 with commit 634f1a7110b439c65fd8a809171c1d2d28bcea6f and fixed in 6.6.48 with commit 921f1acf0c3cf6b1260ab57a8a6e8b3d5f3023d5 |
| Issue introduced in 6.4 with commit 634f1a7110b439c65fd8a809171c1d2d28bcea6f and fixed in 6.10.7 with commit b4ee8cf1acc5018ed1369150d7bb3e0d0f79e135 |
| Issue introduced in 6.4 with commit 634f1a7110b439c65fd8a809171c1d2d28bcea6f and fixed in 6.11 with commit 69139d2919dd4aa9a553c8245e7c63e82613e3fc |
| |
| 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-2024-44996 |
| 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: |
| include/net/af_vsock.h |
| net/vmw_vsock/af_vsock.c |
| net/vmw_vsock/vsock_bpf.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/921f1acf0c3cf6b1260ab57a8a6e8b3d5f3023d5 |
| https://git.kernel.org/stable/c/b4ee8cf1acc5018ed1369150d7bb3e0d0f79e135 |
| https://git.kernel.org/stable/c/69139d2919dd4aa9a553c8245e7c63e82613e3fc |
