| 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-2021-47358: staging: greybus: uart: fix tty use after free |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| staging: greybus: uart: fix tty use after free |
| |
| User space can hold a tty open indefinitely and tty drivers must not |
| release the underlying structures until the last user is gone. |
| |
| Switch to using the tty-port reference counter to manage the life time |
| of the greybus tty state to avoid use after free after a disconnect. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47358 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 4.9.285 with commit 92b67aaafb7c449db9f0c3dcabc0ff967cb3a42d |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 4.14.249 with commit 64062fcaca8872f063ec9da011e7bf30470be33f |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 4.19.209 with commit a5cfd51f6348e8fd7531461366946039c29c7e69 |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 5.4.150 with commit 4dc56951a8d9d61d364d346c61a5f1d70b4f5e14 |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 5.10.70 with commit b9e697e60ce9890e9258a73eb061288e7d68e5e6 |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 5.14.9 with commit 9872ff6fdce8b229f01993b611b5d1719cb70ff1 |
| Issue introduced in 4.9 with commit a18e15175708d39abbe9746ddc3479466b7800c3 and fixed in 5.15 with commit 92dc0b1f46e12cfabd28d709bb34f7a39431b44f |
| |
| 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-2021-47358 |
| 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/staging/greybus/uart.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/92b67aaafb7c449db9f0c3dcabc0ff967cb3a42d |
| https://git.kernel.org/stable/c/64062fcaca8872f063ec9da011e7bf30470be33f |
| https://git.kernel.org/stable/c/a5cfd51f6348e8fd7531461366946039c29c7e69 |
| https://git.kernel.org/stable/c/4dc56951a8d9d61d364d346c61a5f1d70b4f5e14 |
| https://git.kernel.org/stable/c/b9e697e60ce9890e9258a73eb061288e7d68e5e6 |
| https://git.kernel.org/stable/c/9872ff6fdce8b229f01993b611b5d1719cb70ff1 |
| https://git.kernel.org/stable/c/92dc0b1f46e12cfabd28d709bb34f7a39431b44f |
