| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37756: net: tls: explicitly disallow disconnect |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: tls: explicitly disallow disconnect |
| |
| syzbot discovered that it can disconnect a TLS socket and then |
| run into all sort of unexpected corner cases. I have a vague |
| recollection of Eric pointing this out to us a long time ago. |
| Supporting disconnect is really hard, for one thing if offload |
| is enabled we'd need to wait for all packets to be _acked_. |
| Disconnect is not commonly used, disallow it. |
| |
| The immediate problem syzbot run into is the warning in the strp, |
| but that's just the easiest bug to trigger: |
| |
| WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 |
| RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 |
| Call Trace: |
| <TASK> |
| tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363 |
| tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043 |
| inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678 |
| sock_recvmsg_nosec net/socket.c:1023 [inline] |
| sock_recvmsg+0x109/0x280 net/socket.c:1045 |
| __sys_recvfrom+0x202/0x380 net/socket.c:2237 |
| |
| The Linux kernel CVE team has assigned CVE-2025-37756 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 5.10.237 with commit 7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 5.15.181 with commit ac91c6125468be720eafde9c973994cb45b61d44 |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 6.1.135 with commit f3ce4d3f874ab7919edca364c147ac735f9f1d04 |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 6.6.88 with commit 2bcad8fefcecdd5f005d8c550b25d703c063c34a |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 6.12.24 with commit 9fcbca0f801580cbb583e9cb274e2c7fbe766ca6 |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 6.13.12 with commit c665bef891e8972e1d3ce5bbc0d42a373346a2c3 |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 6.14.3 with commit 8513411ec321942bd3cfed53d5bb700665c67d86 |
| Issue introduced in 4.13 with commit 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 and fixed in 6.15 with commit 5071a1e606b30c0c11278d3c6620cd6a24724cf6 |
| |
| 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-2025-37756 |
| 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/tls/tls_main.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/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf |
| https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44 |
| https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04 |
| https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a |
| https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6 |
| https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3 |
| https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86 |
| https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6 |
