| 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-2021-46905: net: hso: fix NULL-deref on disconnect regression |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: hso: fix NULL-deref on disconnect regression |
| |
| Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device |
| unregistration") fixed the racy minor allocation reported by syzbot, but |
| introduced an unconditional NULL-pointer dereference on every disconnect |
| instead. |
| |
| Specifically, the serial device table must no longer be accessed after |
| the minor has been released by hso_serial_tty_unregister(). |
| |
| The Linux kernel CVE team has assigned CVE-2021-46905 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19.187 with commit 92028d7a31e55d53e41cff679156b9432cffcb36 and fixed in 4.19.189 with commit 5c17cfe155d21954b4c7e2a78fa771cebcd86725 |
| Issue introduced in 5.4.112 with commit 4a2933c88399c0ebc738db39bbce3ae89786d723 and fixed in 5.4.115 with commit d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e |
| Issue introduced in 5.10.30 with commit dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac and fixed in 5.10.33 with commit 90642ee9eb581a13569b1c0bd57e85d962215273 |
| Issue introduced in 5.11.14 with commit 388d05f70f1ee0cac4a2068fd295072f1a44152a and fixed in 5.11.17 with commit 0f000005da31f6947f843ce6b3e3a960540c6e00 |
| Issue introduced in 5.12 with commit 8a12f8836145ffe37e9c8733dce18c22fb668b66 and fixed in 5.12.1 with commit 41c44e1f3112d7265dae522c026399b2a42d19ef |
| Issue introduced in 5.12 with commit 8a12f8836145ffe37e9c8733dce18c22fb668b66 and fixed in 5.13 with commit 2ad5692db72874f02b9ad551d26345437ea4f7f3 |
| |
| 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-2021-46905 |
| 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: |
| drivers/net/usb/hso.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/5871761c5f0f20d6e98bf3b6bd7486d857589554 |
| https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e |
| https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1 |
| https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725 |
| https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e |
| https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273 |
| https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00 |
| https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef |
| https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3 |
