| From bippy-1.0.0 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-2024-36913: Drivers: hv: vmbus: Leak pages if set_memory_encrypted() fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| Drivers: hv: vmbus: Leak pages if set_memory_encrypted() fails |
| |
| In CoCo VMs it is possible for the untrusted host to cause |
| set_memory_encrypted() or set_memory_decrypted() to fail such that an |
| error is returned and the resulting memory is shared. Callers need to |
| take care to handle these errors to avoid returning decrypted (shared) |
| memory to the page allocator, which could lead to functional or security |
| issues. |
| |
| VMBus code could free decrypted pages if set_memory_encrypted()/decrypted() |
| fails. Leak the pages if this happens. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36913 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit f2f136c05fb6093818a3b3fefcba46231ac66a62 and fixed in 6.6.31 with commit 6123a4e8e25bd40cf44db14694abac00e6b664e6 |
| Issue introduced in 5.16 with commit f2f136c05fb6093818a3b3fefcba46231ac66a62 and fixed in 6.8.10 with commit e813a0fc2e597146e9cebea61ced9c796d4e308f |
| Issue introduced in 5.16 with commit f2f136c05fb6093818a3b3fefcba46231ac66a62 and fixed in 6.9 with commit 03f5a999adba062456c8c818a683beb1b498983a |
| |
| 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-2024-36913 |
| 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/hv/connection.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/6123a4e8e25bd40cf44db14694abac00e6b664e6 |
| https://git.kernel.org/stable/c/e813a0fc2e597146e9cebea61ced9c796d4e308f |
| https://git.kernel.org/stable/c/03f5a999adba062456c8c818a683beb1b498983a |
