| 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-2024-40984: ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine." |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine." |
| |
| Undo the modifications made in commit d410ee5109a1 ("ACPICA: avoid |
| "Info: mapping multiple BARs. Your kernel is fine.""). The initial |
| purpose of this commit was to stop memory mappings for operation |
| regions from overlapping page boundaries, as it can trigger warnings |
| if different page attributes are present. |
| |
| However, it was found that when this situation arises, mapping |
| continues until the boundary's end, but there is still an attempt to |
| read/write the entire length of the map, leading to a NULL pointer |
| deference. For example, if a four-byte mapping request is made but |
| only one byte is mapped because it hits the current page boundary's |
| end, a four-byte read/write attempt is still made, resulting in a NULL |
| pointer deference. |
| |
| Instead, map the entire length, as the ACPI specification does not |
| mandate that it must be within the same page boundary. It is |
| permissible for it to be mapped across different regions. |
| |
| The Linux kernel CVE team has assigned CVE-2024-40984 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 4.19.317 with commit 435ecc978c3d5d0c4e172ec5b956dc1904061d98 |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 5.4.279 with commit ae465109d82f4fb03c5adbe85f2d6a6a3d59124c |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 5.10.221 with commit 6eca23100e9030725f69c1babacd58803f29ec8d |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 5.15.162 with commit dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 6.1.96 with commit ddc1f5f124479360a1fd43f73be950781d172239 |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 6.6.36 with commit 434c6b924e1f4c219aab2d9e05fe79c5364e37d3 |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 6.9.7 with commit e21a4c9129c72fa54dd00f5ebf71219b41d43c04 |
| Issue introduced in 2.6.32 with commit d410ee5109a1633a686a5663c6743a92e1181f9b and fixed in 6.10 with commit a83e1385b780d41307433ddbc86e3c528db031f0 |
| |
| 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-2024-40984 |
| 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/acpi/acpica/exregion.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/435ecc978c3d5d0c4e172ec5b956dc1904061d98 |
| https://git.kernel.org/stable/c/ae465109d82f4fb03c5adbe85f2d6a6a3d59124c |
| https://git.kernel.org/stable/c/6eca23100e9030725f69c1babacd58803f29ec8d |
| https://git.kernel.org/stable/c/dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f |
| https://git.kernel.org/stable/c/ddc1f5f124479360a1fd43f73be950781d172239 |
| https://git.kernel.org/stable/c/434c6b924e1f4c219aab2d9e05fe79c5364e37d3 |
| https://git.kernel.org/stable/c/e21a4c9129c72fa54dd00f5ebf71219b41d43c04 |
| https://git.kernel.org/stable/c/a83e1385b780d41307433ddbc86e3c528db031f0 |
