Linux: Use After Free
CVE-2024-47718 is a high-severity use after free vulnerability in Linux, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions a0c1e2da652cf70825739bc12d49ea15805690bf, ceaab3fb64d6a5426a3db8f87f3e5757964f2532, 7887ad11995a4142671cc49146db536f923c8568 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.25% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to a0c1e2da652cf70825739bc12d49ea15805690bf or ceaab3fb64d6a5426a3db8f87f3e5757964f2532 or 7887ad11995a4142671cc49146db536f923c8568 or 1b8178a2ae272256ea0dc4f940320a81003535e2, whichever matches your release line, or a later version.
- Update SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to V1.1.1 or a later version.
- Update Linux Kernel to 5.10.227 or 5.15.168 or 6.1.113 or 6.6.54, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, a0c1e2da652cf70825739bc12d49ea15805690bf; c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, ceaab3fb64d6a5426a3db8f87f3e5757964f2532; c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, 7887ad11995a4142671cc49146db536f923c8568; c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, 1b8178a2ae272256ea0dc4f940320a81003535e2; c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, 9432185540bafd42b7bfac6e6ef2f0a0fb4be447; c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, e9a78d9417e167410d6fb83c4e908b077ad8ba6d; c8e5695eae9959fc5774c0f490f2450be8bad3de up to, but not including, 0e735a4c6137262bcefe45bb52fde7b1f5fc6c4d; 5.6 | a0c1e2da652cf70825739bc12d49ea15805690bf, ceaab3fb64d6a5426a3db8f87f3e5757964f2532, 7887ad11995a4142671cc49146db536f923c8568, 1b8178a2ae272256ea0dc4f940320a81003535e2, 9432185540bafd42b7bfac6e6ef2f0a0fb4be447, e9a78d9417e167410d6fb83c4e908b077ad8ba6d |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | before V1.1.1 | V1.1.1 |
| Linux | Linux Kernel | 5.6 up to, but not including, 5.10.227; 5.11 up to, but not including, 5.15.168; 5.16 up to, but not including, 6.1.113; 6.2 up to, but not including, 6.6.54; 6.7 up to, but not including, 6.10.13; 6.11 up to, but not including, 6.11.2 | 5.10.227, 5.15.168, 6.1.113, 6.6.54, 6.10.13, 6.11.2 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: wifi: rtw88: always wait for both firmware loading attempts In 'rtw_wait_firmware_completion()', always wait for both (regular and wowlan) firmware loading attempts. Otherwise if 'rtw_usb_intf_init()' has failed in 'rtw_usb_probe()', 'rtw_usb_disconnect()' may issue 'ieee80211_free_hw()' when one of 'rtw_load_firmware_cb()' (usually the wowlan one) is still in progress, causing UAF detected by KASAN.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
How developers prevent this class of flaw
- Choose a language that provides automatic memory management.
- When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/0e735a4c6137262bcefe45bb52fde7b1f5fc6c4d
- git.kernel.org/stable/c/1b8178a2ae272256ea0dc4f940320a81003535e2
- git.kernel.org/stable/c/7887ad11995a4142671cc49146db536f923c8568
- git.kernel.org/stable/c/9432185540bafd42b7bfac6e6ef2f0a0fb4be447
- git.kernel.org/stable/c/a0c1e2da652cf70825739bc12d49ea15805690bf
- git.kernel.org/stable/c/ceaab3fb64d6a5426a3db8f87f3e5757964f2532
- git.kernel.org/stable/c/e9a78d9417e167410d6fb83c4e908b077ad8ba6d
Other references
Recent Use After Free vulnerabilities
- 7.0 High severity
- 7.0 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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