| 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-2022-48732: drm/nouveau: fix off by one in BIOS boundary checking |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/nouveau: fix off by one in BIOS boundary checking |
| |
| Bounds checking when parsing init scripts embedded in the BIOS reject |
| access to the last byte. This causes driver initialization to fail on |
| Apple eMac's with GeForce 2 MX GPUs, leaving the system with no working |
| console. |
| |
| This is probably only seen on OpenFirmware machines like PowerPC Macs |
| because the BIOS image provided by OF is only the used parts of the ROM, |
| not a power-of-two blocks read from PCI directly so PCs always have |
| empty bytes at the end that are never accessed. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48732 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 4.9.300 with commit d4b746e60fd8eaa8016e144223abe91158edcdad |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 4.14.265 with commit 909d3ec1bf9f0ec534bfc081b77c0836fea7b0e2 |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 4.19.228 with commit b2a21669ee98aafc41c6d42ef15af4dab9e6e882 |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 5.4.178 with commit acc887ba88333f5fec49631f12d8cc7ebd95781c |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 5.10.99 with commit f071d9fa857582d7bd77f4906691f73d3edeab73 |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 5.15.22 with commit d877e814a62b7de9069aeff8bc1d979dfc996e06 |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 5.16.8 with commit e7c36fa8a1e63b08312162179c78a0c7795ea369 |
| Issue introduced in 4.8 with commit 4d4e9907ff572bb1d1c0f6913ad6e3d6d4525077 and fixed in 5.17 with commit 1b777d4d9e383d2744fc9b3a09af6ec1893c8b1a |
| |
| 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-2022-48732 |
| 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/gpu/drm/nouveau/nvkm/subdev/bios/base.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/d4b746e60fd8eaa8016e144223abe91158edcdad |
| https://git.kernel.org/stable/c/909d3ec1bf9f0ec534bfc081b77c0836fea7b0e2 |
| https://git.kernel.org/stable/c/b2a21669ee98aafc41c6d42ef15af4dab9e6e882 |
| https://git.kernel.org/stable/c/acc887ba88333f5fec49631f12d8cc7ebd95781c |
| https://git.kernel.org/stable/c/f071d9fa857582d7bd77f4906691f73d3edeab73 |
| https://git.kernel.org/stable/c/d877e814a62b7de9069aeff8bc1d979dfc996e06 |
| https://git.kernel.org/stable/c/e7c36fa8a1e63b08312162179c78a0c7795ea369 |
| https://git.kernel.org/stable/c/1b777d4d9e383d2744fc9b3a09af6ec1893c8b1a |
