CVE-2024-35955
Description
In the Linux kernel, the following vulnerability has been resolved: kprobes: Fix possible use-after-free issue on kprobe registration When unloading a module, its state is changing MODULE_STATE_LIVE -> MODULE_STATE_GOING -> MODULE_STATE_UNFORMED. Each change will take a time. `is_module_text_address()` and `__module_text_address()` works with MODULE_STATE_LIVE and MODULE_STATE_GOING. If we use `is_module_text_address()` and `__module_text_address()` separately, there is a chance that the first one is succeeded but the next one is failed because module->state becomes MODULE_STATE_UNFORMED between those operations. In `check_kprobe_address_safe()`, if the second `__module_text_address()` is failed, that is ignored because it expected a kernel_text address. But it may have failed simply because module->state has been changed to MODULE_STATE_UNFORMED. In this case, arm_kprobe() will try to modify non-exist module text address (use-after-free). To fix this problem, we should not use separated `is_module_text_address()` and `__module_text_address()`, but use only `__module_text_address()` once and do `try_module_get(module)` which is only available with MODULE_STATE_LIVE.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2024-35955
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2024-35955.html
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2f
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/b5808d40093403334d939e2c3c417144d12a6f33
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26d
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2e
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.90-1 |
| debian | bullseye | fixed | 5.10.216-1 |
| debian | forky | fixed | 6.8.9-1 |
| debian | sid | fixed | 6.8.9-1 |
| debian | trixie | fixed | 6.8.9-1 |
| debian | 10.0 | affected | |
| linux-kernel | affected | 4.15 | |
| linux-kernel | 6.9 | affected | |
References
- https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2e
- https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8
- https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0
- https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26d
- https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808
- https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412
- https://git.kernel.org/stable/c/b5808d40093403334d939e2c3c417144d12a6f33
- https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2f
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
- https://www.suse.com/security/cve/CVE-2024-35955.html
- https://security-tracker.debian.org/tracker/CVE-2024-35955
CWEs
CWE-416
Verify integrity in audit chain (admin only). AS-IS.