| 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-2024-41005: netpoll: Fix race condition in netpoll_owner_active |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netpoll: Fix race condition in netpoll_owner_active |
| |
| KCSAN detected a race condition in netpoll: |
| |
| BUG: KCSAN: data-race in net_rx_action / netpoll_send_skb |
| write (marked) to 0xffff8881164168b0 of 4 bytes by interrupt on cpu 10: |
| net_rx_action (./include/linux/netpoll.h:90 net/core/dev.c:6712 net/core/dev.c:6822) |
| <snip> |
| read to 0xffff8881164168b0 of 4 bytes by task 1 on cpu 2: |
| netpoll_send_skb (net/core/netpoll.c:319 net/core/netpoll.c:345 net/core/netpoll.c:393) |
| netpoll_send_udp (net/core/netpoll.c:?) |
| <snip> |
| value changed: 0x0000000a -> 0xffffffff |
| |
| This happens because netpoll_owner_active() needs to check if the |
| current CPU is the owner of the lock, touching napi->poll_owner |
| non atomically. The ->poll_owner field contains the current CPU holding |
| the lock. |
| |
| Use an atomic read to check if the poll owner is the current CPU. |
| |
| The Linux kernel CVE team has assigned CVE-2024-41005 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.221 with commit 43c0ca793a18578a0f5b305dd77fcf7ed99f1265 |
| Fixed in 5.15.162 with commit efd29cd9c7b8369dfc7bcb34637e6bf1a188aa8e |
| Fixed in 6.1.96 with commit 96826b16ef9c6568d31a1f6ceaa266411a46e46c |
| Fixed in 6.6.36 with commit 3f1a155950a1685ffd0fd7175b3f671da8771f3d |
| Fixed in 6.9.7 with commit a130e7da73ae93afdb4659842267eec734ffbd57 |
| Fixed in 6.10 with commit c2e6a872bde9912f1a7579639c5ca3adf1003916 |
| |
| 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-2024-41005 |
| 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/core/netpoll.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/43c0ca793a18578a0f5b305dd77fcf7ed99f1265 |
| https://git.kernel.org/stable/c/efd29cd9c7b8369dfc7bcb34637e6bf1a188aa8e |
| https://git.kernel.org/stable/c/96826b16ef9c6568d31a1f6ceaa266411a46e46c |
| https://git.kernel.org/stable/c/3f1a155950a1685ffd0fd7175b3f671da8771f3d |
| https://git.kernel.org/stable/c/a130e7da73ae93afdb4659842267eec734ffbd57 |
| https://git.kernel.org/stable/c/c2e6a872bde9912f1a7579639c5ca3adf1003916 |
