| 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-2024-57898: wifi: cfg80211: clear link ID from bitmap during link delete after clean up |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| wifi: cfg80211: clear link ID from bitmap during link delete after clean up |
| |
| Currently, during link deletion, the link ID is first removed from the |
| valid_links bitmap before performing any clean-up operations. However, some |
| functions require the link ID to remain in the valid_links bitmap. One |
| such example is cfg80211_cac_event(). The flow is - |
| |
| nl80211_remove_link() |
| cfg80211_remove_link() |
| ieee80211_del_intf_link() |
| ieee80211_vif_set_links() |
| ieee80211_vif_update_links() |
| ieee80211_link_stop() |
| cfg80211_cac_event() |
| |
| cfg80211_cac_event() requires link ID to be present but it is cleared |
| already in cfg80211_remove_link(). Ultimately, WARN_ON() is hit. |
| |
| Therefore, clear the link ID from the bitmap only after completing the link |
| clean-up. |
| |
| The Linux kernel CVE team has assigned CVE-2024-57898 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.12.9 with commit ae07daf440d3220d0986e676317a5da66e4f9dfd |
| Fixed in 6.13 with commit b5c32ff6a3a38c74facdd1fe34c0d709a55527fd |
| |
| 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-2024-57898 |
| 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: |
| net/mac80211/cfg.c |
| net/wireless/util.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/ae07daf440d3220d0986e676317a5da66e4f9dfd |
| https://git.kernel.org/stable/c/b5c32ff6a3a38c74facdd1fe34c0d709a55527fd |
