| 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-2025-37898: powerpc64/ftrace: fix module loading without patchable function entries |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| powerpc64/ftrace: fix module loading without patchable function entries |
| |
| get_stubs_size assumes that there must always be at least one patchable |
| function entry, which is not always the case (modules that export data |
| but no code), otherwise it returns -ENOEXEC and thus the section header |
| sh_size is set to that value. During module_memory_alloc() the size is |
| passed to execmem_alloc() after being page-aligned and thus set to zero |
| which will cause it to fail the allocation (and thus module loading) as |
| __vmalloc_node_range() checks for zero-sized allocs and returns null: |
| |
| [ 115.466896] module_64: cast_common: doesn't contain __patchable_function_entries. |
| [ 115.469189] ------------[ cut here ]------------ |
| [ 115.469496] WARNING: CPU: 0 PID: 274 at mm/vmalloc.c:3778 __vmalloc_node_range_noprof+0x8b4/0x8f0 |
| ... |
| [ 115.478574] ---[ end trace 0000000000000000 ]--- |
| [ 115.479545] execmem: unable to allocate memory |
| |
| Fix this by removing the check completely, since it is anyway not |
| helpful to propagate this as an error upwards. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37898 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.13 with commit eec37961a56aa4f3fe1c33ffd48eec7d1bb0c009 and fixed in 6.14.6 with commit 358b559afec7806b9d01c2405b490e782c347022 |
| Issue introduced in 6.13 with commit eec37961a56aa4f3fe1c33ffd48eec7d1bb0c009 and fixed in 6.15 with commit 534f5a8ba27863141e29766467a3e1f61bcb47ac |
| |
| 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-2025-37898 |
| 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/powerpc/kernel/module_64.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/358b559afec7806b9d01c2405b490e782c347022 |
| https://git.kernel.org/stable/c/534f5a8ba27863141e29766467a3e1f61bcb47ac |
