CVE-2024-50222: iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
First published: Sat Nov 09 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP generic/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem, on huge=always tmpfs, issues a warning and then hangs (interruptibly): WARNING: CPU: 5 PID: 3517 at mm/highmem.c:622 kunmap_local_indexed+0x62/0xc9 CPU: 5 UID: 0 PID: 3517 Comm: cp Not tainted 6.12.0-rc4 #2 ... copy_page_from_iter_atomic+0xa6/0x5ec generic_perform_write+0xf6/0x1b4 shmem_file_write_iter+0x54/0x67 Fix copy_page_from_iter_atomic() by limiting it in that case (include/linux/skbuff.h skb_frag_must_loop() does similar). But going forward, perhaps CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is too surprising, has outlived its usefulness, and should just be removed?
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.6<6.6.60 | |
| Linux Kernel | >=6.7<6.11.7 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 | |
| Linux Kernel | =6.12-rc5 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
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Reference Links
- https://git.kernel.org/stable/c/4f7ffa83fa79dd52efbaef366c850aaaae06a469
- https://git.kernel.org/stable/c/3a303409f271dfe0987b8f79595138340497a32d
- https://git.kernel.org/stable/c/c749d9b7ebbc5716af7a95f7768634b30d9446ec
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50222
- https://nvd.nist.gov/vuln/detail/CVE-2024-50222
- https://launchpad.net/bugs/cve/CVE-2024-50222
- https://security-tracker.debian.org/tracker/CVE-2024-50222
- https://ubuntu.com/security/CVE-2024-50222
- https://git.kernel.org/linus/c749d9b7ebbc5716af7a95f7768634b30d9446ec
Frequently Asked Questions
What is the severity of CVE-2024-50222?
CVE-2024-50222 is considered a high severity vulnerability due to its potential to cause system hangs and warnings in affected Linux kernels.
How do I fix CVE-2024-50222?
To fix CVE-2024-50222, ensure your system is updated to Linux kernel versions 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.16-1 or later.
Which systems are affected by CVE-2024-50222?
CVE-2024-50222 affects Linux kernel versions between 6.7 and 6.6.60, along with specific configurations like CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP.
Is there a workaround for CVE-2024-50222?
Currently, the most effective mitigation for CVE-2024-50222 is to update to the latest fixed kernel version.
What can happen if CVE-2024-50222 is exploited?
Exploitation of CVE-2024-50222 can lead to system instability, causing hangs and interruptions during operations on affected systems.
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