CVE-2025-38439

In the Linux kernel, the following vulnerability has been resolved:

bnxten: Set DMA unmap len correctly for XDPREDIRECT

When transmitting an XDPREDIRECT packet, call dmaunmaplenset() 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 iommudmaunmap+0x159/0x170 RIP: 0010:iommudmaunmap+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> ? showregs+0x6d/0x80 ? _warn+0x89/0x160 ? _iommudmaunmap+0x159/0x170 ? reportbug+0x17e/0x1b0 ? handlebug+0x46/0x90 ? excinvalidop+0x18/0x80 ? asmexcinvalidop+0x1b/0x20 ? _iommudmaunmap+0x159/0x170 ? _iommudmaunmap+0xb3/0x170 iommudmaunmappage+0x4f/0x100 dmaunmappageattrs+0x52/0x220 ? srsoaliasreturnthunk+0x5/0xfbef5 ? xdpreturnframe+0x2e/0xd0 bnxttxintxdp+0xdf/0x440 [bnxten] _bnxtpollworkdone+0x81/0x1e0 [bnxten] bnxtpoll+0xd3/0x1e0 [bnxten]