# CVE-2021-46913: linux: In the Linux kernel, the following vulnerability has been resolved:  netfilter: nftables: clone set element expressio...

CVE-2021-46913 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46913, released February 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-46913
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 27, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  netfilter: nftables: clone set element expression template  memcpy() breaks when using connlimit in set elements. Use nft_expr_clone() to initialize the connlimit expression list, otherwise connlimit garbage collector crashes when walking on the list head copy.  [  493.064656] Workqueue: events_power_efficient nft_rhash_gc [nf_tables] [  493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount] [  493.064694] Code: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83 [  493.064699] RSP: 0018:ffffc90000417dc0 EFLAGS: 00010297 [  493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 0000000000000000 [  493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0 [  493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c [  493.064714] R10: ffffffff8219f838 R11: 0000000000000017 R12: 0000000000000001 [  493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000 [  493.064721] FS:  0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000 [  493.064725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [  493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0 [  493.064733] Call Trace: [  493.064737]  nf_conncount_gc_list+0x8f/0x150 [nf_conncount] [  493.064746]  nft_rhash_gc+0x106/0x390 [nf_tables]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-46913](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46913.md) | Feb 27, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-46913](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46913.md) | Feb 27, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-46913](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46913.md) | Feb 27, 2024 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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