CVE-2025-38439

bnxt_en: Set DMA unmap len correctly for XDP_REDIRECT

MEDIUM

5.5

CVSS Score

Published: July 25, 2025 at 03:27 PM UTC

Updated: October 15, 2026 at 10:18 PM UTC

2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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]

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

11.0

Linux Kernel · Linux

95%

5.11 ≤ v < 5.15.1895.16 ≤ v < 6.1.1465.3 ≤ v < 5.4.2965.5 ≤ v < 5.10.2406.13 ≤ v < 6.15.76.2 ≤ v < 6.6.996.7 ≤ v < 6.12.396.16 6.16 rc1 6.16 rc2 6.16 rc3 6.16 rc4 6.16 rc5f18c2b77b2e4eec2313d519ba125bd6a069513cf

Vendor states this is fixed in 16ae306602163fcb7ae83f2701b542e43c100cee (fixed)

Vendor states this is fixed in 3cdf199d4755d477972ee87110b2aebc88b3cfad (fixed)

Vendor states this is fixed in 50dad9909715094e7d9ca25e9e0412b875987519 (fixed)

Vendor states this is fixed in 5909679a82cd74cf0343d9e3ddf4b6931aa7e613 (fixed)

Vendor states this is fixed in 8d672a1a6bfc81fef9151925c9c0481f4acf4bec (fixed)

Vendor states this is fixed in e260f4d49370c85a4701d43c6d16b8c39f8b605f (fixed)

Vendor states this is fixed in f154e41e1d9d15ab21300ba7bbf0ebb5cb3b9c2a (fixed)

Vendor states this is fixed in f9eaf6d036075dc820520e1194692c0619b7297b (fixed)

Vendor states this is fixed in 5.10.240 (unaffected)

Vendor states this is fixed in 5.15.189 (unaffected)

Vendor states this is fixed in 5.3 (unaffected)

Vendor states this is fixed in 5.4.296 (unaffected)