CVE-2024-35955
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.18% probability · 66th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2ePatch
- https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8Patch
- https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0Patch
- https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26dPatch
- https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808Patch
- https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412Patch
- https://git.kernel.org/stable/c/b5808d40093403334d939e2c3c417144d12a6f33Patch
- https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2fPatch
- https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2ePatch
- https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8Patch
- https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0Patch
- https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26dPatch
- https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808Patch
- https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412Patch
- https://git.kernel.org/stable/c/b5808d40093403334d939e2c3c417144d12a6f33Patch
- https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2fPatch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.