| 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-2024-40931: mptcp: ensure snd_una is properly initialized on connect |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mptcp: ensure snd_una is properly initialized on connect |
| |
| This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt |
| is properly initialized on connect"). It turns out that syzkaller can |
| trigger the retransmit after fallback and before processing any other |
| incoming packet - so that snd_una is still left uninitialized. |
| |
| Address the issue explicitly initializing snd_una together with snd_nxt |
| and write_seq. |
| |
| The Linux kernel CVE team has assigned CVE-2024-40931 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.9 with commit 8fd738049ac3d67a937d36577763b47180aae1ad and fixed in 5.10.221 with commit 208cd22ef5e57f82d38ec11c1a1703f9401d6dde |
| Issue introduced in 5.9 with commit 8fd738049ac3d67a937d36577763b47180aae1ad and fixed in 5.15.162 with commit 7b9c7fc8600b64a86e4b47b2d190bba380267726 |
| Issue introduced in 5.9 with commit 8fd738049ac3d67a937d36577763b47180aae1ad and fixed in 6.1.95 with commit f03c46eabb3a67bd2993e237ab5517f00a5f1813 |
| Issue introduced in 5.9 with commit 8fd738049ac3d67a937d36577763b47180aae1ad and fixed in 6.6.35 with commit f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f |
| Issue introduced in 5.9 with commit 8fd738049ac3d67a937d36577763b47180aae1ad and fixed in 6.9.6 with commit ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce |
| Issue introduced in 5.9 with commit 8fd738049ac3d67a937d36577763b47180aae1ad and fixed in 6.10 with commit 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3 |
| |
| 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-2024-40931 |
| 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/mptcp/protocol.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/208cd22ef5e57f82d38ec11c1a1703f9401d6dde |
| https://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726 |
| https://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813 |
| https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f |
| https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce |
| https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3 |
