| 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-2025-21760: ndisc: extend RCU protection in ndisc_send_skb() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ndisc: extend RCU protection in ndisc_send_skb() |
| |
| ndisc_send_skb() can be called without RTNL or RCU held. |
| |
| Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() |
| and avoid a potential UAF. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21760 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 5.4.291 with commit 10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1 |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 5.10.235 with commit 4d576202b90b1b95a7c428a80b536f91b8201bcc |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 5.15.179 with commit e24d225e4cb8cf108bde00b76594499b98f0a74d |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 6.1.129 with commit a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 6.6.79 with commit ae38982f521621c216fc2f5182cd091f4734641d |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 6.12.16 with commit 789230e5a8c1097301afc802e242c79bc8835c67 |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 6.13.4 with commit 04e05112f10354ffc3bb6cc796d553bab161594c |
| Issue introduced in 2.6.26 with commit 1762f7e88eb34f653b4a915be99a102e347dd45e and fixed in 6.14 with commit ed6ae1f325d3c43966ec1b62ac1459e2b8e45640 |
| |
| 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-2025-21760 |
| 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/ipv6/ndisc.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/10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1 |
| https://git.kernel.org/stable/c/4d576202b90b1b95a7c428a80b536f91b8201bcc |
| https://git.kernel.org/stable/c/e24d225e4cb8cf108bde00b76594499b98f0a74d |
| https://git.kernel.org/stable/c/a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d |
| https://git.kernel.org/stable/c/ae38982f521621c216fc2f5182cd091f4734641d |
| https://git.kernel.org/stable/c/789230e5a8c1097301afc802e242c79bc8835c67 |
| https://git.kernel.org/stable/c/04e05112f10354ffc3bb6cc796d553bab161594c |
| https://git.kernel.org/stable/c/ed6ae1f325d3c43966ec1b62ac1459e2b8e45640 |
