| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-49936: net/xen-netback: prevent UAF in xenvif_flush_hash() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net/xen-netback: prevent UAF in xenvif_flush_hash() |
| |
| During the list_for_each_entry_rcu iteration call of xenvif_flush_hash, |
| kfree_rcu does not exist inside the rcu read critical section, so if |
| kfree_rcu is called when the rcu grace period ends during the iteration, |
| UAF occurs when accessing head->next after the entry becomes free. |
| |
| Therefore, to solve this, you need to change it to list_for_each_entry_safe. |
| |
| The Linux kernel CVE team has assigned CVE-2024-49936 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 5.4.290 with commit 3c4423b0c4b98213b3438e15061e1d08220e6982 |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 5.10.227 with commit a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 5.15.168 with commit a0465723b8581cad27164c9073fd780904cd22d4 |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 6.1.113 with commit efcff6ce7467f01f0753609f420333f3f2ceceda |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 6.6.55 with commit 143edf098b80669d05245b2f2367dd156a83a2c5 |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 6.10.14 with commit d408889d4b54f5501e4becc4dbbb9065143fbf4e |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 6.11.3 with commit 54d8639af5568fc41c0e274fc3ec9cf86c59fcbb |
| Issue introduced in 4.11 with commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 and fixed in 6.12 with commit 0fa5e94a1811d68fbffa0725efe6d4ca62c03d12 |
| |
| 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-2024-49936 |
| 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/xen-netback/hash.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/3c4423b0c4b98213b3438e15061e1d08220e6982 |
| https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c |
| https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4 |
| https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda |
| https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5 |
| https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e |
| https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb |
| https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12 |
