| 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-2023-52927: netfilter: allow exp not to be removed in nf_ct_find_expectation |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netfilter: allow exp not to be removed in nf_ct_find_expectation |
| |
| Currently nf_conntrack_in() calling nf_ct_find_expectation() will |
| remove the exp from the hash table. However, in some scenario, we |
| expect the exp not to be removed when the created ct will not be |
| confirmed, like in OVS and TC conntrack in the following patches. |
| |
| This patch allows exp not to be removed by setting IPS_CONFIRMED |
| in the status of the tmpl. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52927 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.1.130 with commit 3fa58a6fbd1e9e5682d09cdafb08fba004cb12ec |
| Fixed in 6.6 with commit 4914109a8e1e494c6aa9852f9e84ec77a5fc643f |
| |
| 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-2023-52927 |
| 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/netfilter/nf_conntrack_expect.h |
| net/netfilter/nf_conntrack_core.c |
| net/netfilter/nf_conntrack_expect.c |
| net/netfilter/nft_ct.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/3fa58a6fbd1e9e5682d09cdafb08fba004cb12ec |
| https://git.kernel.org/stable/c/4914109a8e1e494c6aa9852f9e84ec77a5fc643f |
