| 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-2024-27414: rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back |
| |
| In the commit d73ef2d69c0d ("rtnetlink: let rtnl_bridge_setlink checks |
| IFLA_BRIDGE_MODE length"), an adjustment was made to the old loop logic |
| in the function `rtnl_bridge_setlink` to enable the loop to also check |
| the length of the IFLA_BRIDGE_MODE attribute. However, this adjustment |
| removed the `break` statement and led to an error logic of the flags |
| writing back at the end of this function. |
| |
| if (have_flags) |
| memcpy(nla_data(attr), &flags, sizeof(flags)); |
| // attr should point to IFLA_BRIDGE_FLAGS NLA !!! |
| |
| Before the mentioned commit, the `attr` is granted to be IFLA_BRIDGE_FLAGS. |
| However, this is not necessarily true fow now as the updated loop will let |
| the attr point to the last NLA, even an invalid NLA which could cause |
| overflow writes. |
| |
| This patch introduces a new variable `br_flag` to save the NLA pointer |
| that points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned |
| error logic. |
| |
| The Linux kernel CVE team has assigned CVE-2024-27414 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4.253 with commit ad46d4861ed36315d3d9e838723ba3e367ecc042 and fixed in 5.4.271 with commit b9fbc44159dfc3e9a7073032752d9e03f5194a6f |
| Issue introduced in 5.10.190 with commit abb0172fa8dc4a4ec51aa992b7269ed65959f310 and fixed in 5.10.212 with commit 882a51a10ecf24ce135d573afa0872aef02c5125 |
| Issue introduced in 5.15.126 with commit 047508edd602921ee8bb0f2aa2100aa2e9bedc75 and fixed in 5.15.151 with commit a1227b27fcccc99dc44f912b479e01a17e2d7d31 |
| Issue introduced in 6.1.45 with commit 8dfac8071d58447e5cace4c4c6fe493ce2f615f6 and fixed in 6.1.81 with commit f2261eb994aa5757c1da046b78e3229a3ece0ad9 |
| Issue introduced in 6.5 with commit d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f and fixed in 6.6.21 with commit 167d8642daa6a44b51de17f8ff0f584e1e762db7 |
| Issue introduced in 6.5 with commit d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f and fixed in 6.7.9 with commit 831bc2728fb48a8957a824cba8c264b30dca1425 |
| Issue introduced in 6.5 with commit d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f and fixed in 6.8 with commit 743ad091fb46e622f1b690385bb15e3cd3daf874 |
| Issue introduced in 6.4.10 with commit 00757f58e37b2d9a6f99e15be484712390cd2bab |
| |
| 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-2024-27414 |
| 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/rtnetlink.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/b9fbc44159dfc3e9a7073032752d9e03f5194a6f |
| https://git.kernel.org/stable/c/882a51a10ecf24ce135d573afa0872aef02c5125 |
| https://git.kernel.org/stable/c/a1227b27fcccc99dc44f912b479e01a17e2d7d31 |
| https://git.kernel.org/stable/c/f2261eb994aa5757c1da046b78e3229a3ece0ad9 |
| https://git.kernel.org/stable/c/167d8642daa6a44b51de17f8ff0f584e1e762db7 |
| https://git.kernel.org/stable/c/831bc2728fb48a8957a824cba8c264b30dca1425 |
| https://git.kernel.org/stable/c/743ad091fb46e622f1b690385bb15e3cd3daf874 |
