| 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-2025-21791: vrf: use RCU protection in l3mdev_l3_out() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| vrf: use RCU protection in l3mdev_l3_out() |
| |
| l3mdev_l3_out() can be called without RCU being held: |
| |
| raw_sendmsg() |
| ip_push_pending_frames() |
| ip_send_skb() |
| ip_local_out() |
| __ip_local_out() |
| l3mdev_ip_out() |
| |
| Add rcu_read_lock() / rcu_read_unlock() pair to avoid |
| a potential UAF. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21791 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 5.4.291 with commit 6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 5.10.235 with commit 20a3489b396764cc9376e32a9172bee26a89dc3b |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 5.15.179 with commit 5bb4228c32261d06e4fbece37ec3828bcc005b6b |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.1.129 with commit c7574740be8ce68a57d0aece24987b9be2114c3c |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.6.79 with commit c40cb5c03e37552d6eff963187109e2c3f78ef6f |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.12.16 with commit 022cac1c693add610ae76ede03adf4d9d5a2cf21 |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.13.4 with commit 7b81425b517accefd46bee854d94954f5c57e019 |
| Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.14 with commit 6d0ce46a93135d96b7fa075a94a88fe0da8e8773 |
| |
| 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-2025-21791 |
| 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/l3mdev.h |
| |
| |
| 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/6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e |
| https://git.kernel.org/stable/c/20a3489b396764cc9376e32a9172bee26a89dc3b |
| https://git.kernel.org/stable/c/5bb4228c32261d06e4fbece37ec3828bcc005b6b |
| https://git.kernel.org/stable/c/c7574740be8ce68a57d0aece24987b9be2114c3c |
| https://git.kernel.org/stable/c/c40cb5c03e37552d6eff963187109e2c3f78ef6f |
| https://git.kernel.org/stable/c/022cac1c693add610ae76ede03adf4d9d5a2cf21 |
| https://git.kernel.org/stable/c/7b81425b517accefd46bee854d94954f5c57e019 |
| https://git.kernel.org/stable/c/6d0ce46a93135d96b7fa075a94a88fe0da8e8773 |
