- Vulnerability/
- CVE-2024-50212
CVE-2024-50212: lib: alloc_tag_module_unload must wait for pending kfree_rcu calls
First published: Sat Nov 09 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: lib: alloc_tag_module_unload must wait for pending kfree_rcu calls Ben Greear reports following splat: ------------[ cut here ]------------ net/netfilter/nf_nat_core.c:1114 module nf_nat func:nf_nat_register_fn has 256 allocated at module unload WARNING: CPU: 1 PID: 10421 at lib/alloc_tag.c:168 alloc_tag_module_unload+0x22b/0x3f0 Modules linked in: nf_nat(-) btrfs ufs qnx4 hfsplus hfs minix vfat msdos fat ... Hardware name: Default string Default string/SKYBAY, BIOS 5.12 08/04/2020 RIP: 0010:alloc_tag_module_unload+0x22b/0x3f0 codetag_unload_module+0x19b/0x2a0 ? codetag_load_module+0x80/0x80 nf_nat module exit calls kfree_rcu on those addresses, but the free operation is likely still pending by the time alloc_tag checks for leaks. Wait for outstanding kfree_rcu operations to complete before checking resolves this warning. Reproducer: unshare -n iptables-nft -t nat -A PREROUTING -p tcp grep nf_nat /proc/allocinfo # will list 4 allocations rmmod nft_chain_nat rmmod nf_nat # will WARN. [akpm@linux-foundation.org: add comment]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/24211fb49c9ac1b576470b7e393a5a0b50af2707
- https://git.kernel.org/stable/c/dc783ba4b9df3fb3e76e968b2cbeb9960069263c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50212
- https://nvd.nist.gov/vuln/detail/CVE-2024-50212
- https://launchpad.net/bugs/cve/CVE-2024-50212
- https://security-tracker.debian.org/tracker/CVE-2024-50212
- https://ubuntu.com/security/CVE-2024-50212
- https://git.kernel.org/linus/dc783ba4b9df3fb3e76e968b2cbeb9960069263c
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