| From bippy-1.2.0 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-2025-37822: riscv: uprobes: Add missing fence.i after building the XOL buffer |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| riscv: uprobes: Add missing fence.i after building the XOL buffer |
| |
| The XOL (execute out-of-line) buffer is used to single-step the |
| replaced instruction(s) for uprobes. The RISC-V port was missing a |
| proper fence.i (i$ flushing) after constructing the XOL buffer, which |
| can result in incorrect execution of stale/broken instructions. |
| |
| This was found running the BPF selftests "test_progs: |
| uprobe_autoattach, attach_probe" on the Spacemit K1/X60, where the |
| uprobes tests randomly blew up. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37822 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.12 with commit 74784081aac8a0f3636965fc230e2d3b7cc123c6 and fixed in 6.12.26 with commit bcf6d3158c5902d92b6d62335af4422b7bf7c4e2 |
| Issue introduced in 5.12 with commit 74784081aac8a0f3636965fc230e2d3b7cc123c6 and fixed in 6.14.5 with commit 1dbb95a36499374c51b47ee8ae258a8862c20978 |
| Issue introduced in 5.12 with commit 74784081aac8a0f3636965fc230e2d3b7cc123c6 and fixed in 6.15 with commit 7d1d19a11cfbfd8bae1d89cc010b2cc397cd0c48 |
| |
| 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-2025-37822 |
| 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: |
| arch/riscv/kernel/probes/uprobes.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/bcf6d3158c5902d92b6d62335af4422b7bf7c4e2 |
| https://git.kernel.org/stable/c/1dbb95a36499374c51b47ee8ae258a8862c20978 |
| https://git.kernel.org/stable/c/7d1d19a11cfbfd8bae1d89cc010b2cc397cd0c48 |
