# CVE-2024-50212: linux: In the Linux kernel, the following vulnerability has been resolved:  lib: alloc_tag_module_unload must wait for pendi...

CVE-2024-50212 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-50212, released November 9, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-50212
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 9, 2024

## Description

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]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.7-1 | [DEBIAN-CVE-2024-50212](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50212.md) | Nov 9, 2024 |
| Linux | linux Debian 14 | 6.11.7-1 | [DEBIAN-CVE-2024-50212](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50212.md) | Nov 9, 2024 |

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