| 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-2024-35827: io_uring/net: fix overflow check in io_recvmsg_mshot_prep() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| io_uring/net: fix overflow check in io_recvmsg_mshot_prep() |
| |
| The "controllen" variable is type size_t (unsigned long). Casting it |
| to int could lead to an integer underflow. |
| |
| The check_add_overflow() function considers the type of the destination |
| which is type int. If we add two positive values and the result cannot |
| fit in an integer then that's counted as an overflow. |
| |
| However, if we cast "controllen" to an int and it turns negative, then |
| negative values *can* fit into an int type so there is no overflow. |
| |
| Good: 100 + (unsigned long)-4 = 96 <-- overflow |
| Bad: 100 + (int)-4 = 96 <-- no overflow |
| |
| I deleted the cast of the sizeof() as well. That's not a bug but the |
| cast is unnecessary. |
| |
| The Linux kernel CVE team has assigned CVE-2024-35827 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit 9b0fc3c054ff2eb13753104884f1045b5bb3a627 and fixed in 6.1.83 with commit 868ec868616438df487b9e2baa5a99f8662cc47c |
| Issue introduced in 6.0 with commit 9b0fc3c054ff2eb13753104884f1045b5bb3a627 and fixed in 6.6.23 with commit 59a534690ecc3af72c6ab121aeac1237a4adae66 |
| Issue introduced in 6.0 with commit 9b0fc3c054ff2eb13753104884f1045b5bb3a627 and fixed in 6.7.11 with commit 0c8c74bb59e7d77554016efc34c2d10376985e5e |
| Issue introduced in 6.0 with commit 9b0fc3c054ff2eb13753104884f1045b5bb3a627 and fixed in 6.8.2 with commit b6563ad0d599110bd5cf8f56c47d279c3ed796fe |
| Issue introduced in 6.0 with commit 9b0fc3c054ff2eb13753104884f1045b5bb3a627 and fixed in 6.9 with commit 8ede3db5061bb1fe28e2c9683329aafa89d2b1b4 |
| |
| 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-2024-35827 |
| 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: |
| io_uring/net.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/868ec868616438df487b9e2baa5a99f8662cc47c |
| https://git.kernel.org/stable/c/59a534690ecc3af72c6ab121aeac1237a4adae66 |
| https://git.kernel.org/stable/c/0c8c74bb59e7d77554016efc34c2d10376985e5e |
| https://git.kernel.org/stable/c/b6563ad0d599110bd5cf8f56c47d279c3ed796fe |
| https://git.kernel.org/stable/c/8ede3db5061bb1fe28e2c9683329aafa89d2b1b4 |
