| 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-2025-21766: ipv4: use RCU protection in __ip_rt_update_pmtu() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipv4: use RCU protection in __ip_rt_update_pmtu() |
| |
| __ip_rt_update_pmtu() must use RCU protection to make |
| sure the net structure it reads does not disappear. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21766 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.9 with commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 and fixed in 5.15.179 with commit ce3c6165fce0f06305c806696882a3ad4b90e33f |
| Issue introduced in 5.9 with commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 and fixed in 6.1.129 with commit ea07480b23225942208f1b754fea1e7ec486d37e |
| Issue introduced in 5.9 with commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 and fixed in 6.6.79 with commit 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 |
| Issue introduced in 5.9 with commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 and fixed in 6.12.16 with commit 4583748b65dee4d61bd50a2214715b4237bc152a |
| Issue introduced in 5.9 with commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 and fixed in 6.13.4 with commit a39f61d212d822b3062d7f70fa0588e50e55664e |
| Issue introduced in 5.9 with commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 and fixed in 6.14 with commit 139512191bd06f1b496117c76372b2ce372c9a41 |
| Issue introduced in 4.14.200 with commit f415c264176e6095e9dee823e09c5bdd0ee0d337 |
| Issue introduced in 4.19.148 with commit 98776a365da509ad923083ae54b38ee521c52742 |
| Issue introduced in 5.4.68 with commit 860e2cc78c697c95bc749abb20047239fa1722ea |
| Issue introduced in 5.8.12 with commit 2b1be6c925cdf4638811765a9160796291494b89 |
| |
| 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-2025-21766 |
| 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/ipv4/route.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/ce3c6165fce0f06305c806696882a3ad4b90e33f |
| https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e |
| https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 |
| https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a |
| https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e |
| https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41 |
