| 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-2024-36019: regmap: maple: Fix cache corruption in regcache_maple_drop() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| regmap: maple: Fix cache corruption in regcache_maple_drop() |
| |
| When keeping the upper end of a cache block entry, the entry[] array |
| must be indexed by the offset from the base register of the block, |
| i.e. max - mas.index. |
| |
| The code was indexing entry[] by only the register address, leading |
| to an out-of-bounds access that copied some part of the kernel |
| memory over the cache contents. |
| |
| This bug was not detected by the regmap KUnit test because it only |
| tests with a block of registers starting at 0, so mas.index == 0. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36019 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.4 with commit f033c26de5a5734625d2dd1dc196745fae186f1b and fixed in 6.6.26 with commit 3af6c5ac72dc5b721058132a0a1d7779e443175e |
| Issue introduced in 6.4 with commit f033c26de5a5734625d2dd1dc196745fae186f1b and fixed in 6.8.5 with commit 51c4440b9d3fd7c8234e6de9170a487c03506e53 |
| Issue introduced in 6.4 with commit f033c26de5a5734625d2dd1dc196745fae186f1b and fixed in 6.9 with commit 00bb549d7d63a21532e76e4a334d7807a54d9f31 |
| |
| 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-2024-36019 |
| 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/base/regmap/regcache-maple.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/3af6c5ac72dc5b721058132a0a1d7779e443175e |
| https://git.kernel.org/stable/c/51c4440b9d3fd7c8234e6de9170a487c03506e53 |
| https://git.kernel.org/stable/c/00bb549d7d63a21532e76e4a334d7807a54d9f31 |
