{"cve":"CVE-2025-21960","nvd":{"published":"2025-04-01T16:15:27.230","modified":"2026-07-30T06:21:59.720","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\neth: bnxt: do not update checksum in bnxt_xdp_build_skb()\n\nThe bnxt_rx_pkt() updates ip_summed value at the end if checksum offload\nis enabled.\nWhen the XDP-MB program is attached and it returns XDP_PASS, the\nbnxt_xdp_build_skb() is called to update skb_shared_info.\nThe main purpose of bnxt_xdp_build_skb() is to update skb_shared_info,\nbut it updates ip_summed value too if checksum offload is enabled.\nThis is actually duplicate work.\n\nWhen the bnxt_rx_pkt() updates ip_summed value, it checks if ip_summed\nis CHECKSUM_NONE or not.\nIt means that ip_summed should be CHECKSUM_NONE at this moment.\nBut ip_summed may already be updated to CHECKSUM_UNNECESSARY in the\nXDP-MB-PASS path.\nSo the by skb_checksum_none_assert() WARNS about it.\n\nThis is duplicate work and updating ip_summed in the\nbnxt_xdp_build_skb() is not needed.\n\nSplat looks like:\nWARNING: CPU: 3 PID: 5782 at ./include/linux/skbuff.h:5155 bnxt_rx_pkt+0x479b/0x7610 [bnxt_en]\nModules linked in: bnxt_re bnxt_en rdma_ucm rdma_cm iw_cm ib_cm ib_uverbs veth xt_nat xt_tcpudp xt_conntrack nft_chain_nat xt_MASQUERADE nf_]\nCPU: 3 UID: 0 PID: 5782 Comm: socat Tainted: G        W          6.14.0-rc4+ #27\nTainted: [W]=WARN\nHardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021\nRIP: 0010:bnxt_rx_pkt+0x479b/0x7610 [bnxt_en]\nCode: 54 24 0c 4c 89 f1 4c 89 ff c1 ea 1f ff d3 0f 1f 00 49 89 c6 48 85 c0 0f 84 4c e5 ff ff 48 89 c7 e8 ca 3d a0 c8 e9 8f f4 ff ff <0f> 0b f\nRSP: 0018:ffff88881ba09928 EFLAGS: 00010202\nRAX: 0000000000000000 RBX: 00000000c7590303 RCX: 0000000000000000\nRDX: 1ffff1104e7d1610 RSI: 0000000000000001 RDI: ffff8881c91300b8\nRBP: ffff88881ba09b28 R08: ffff888273e8b0d0 R09: ffff888273e8b070\nR10: ffff888273e8b010 R11: ffff888278b0f000 R12: ffff888273e8b080\nR13: ffff8881c9130e00 R14: ffff8881505d3800 R15: ffff888273e8b000\nFS:  00007f5a2e7be080(0000) GS:ffff88881ba00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fff2e708ff8 CR3: 000000013e3b0000 CR4: 00000000007506f0\nPKRU: 55555554\nCall Trace:\n <IRQ>\n ? __warn+0xcd/0x2f0\n ? bnxt_rx_pkt+0x479b/0x7610\n ? report_bug+0x326/0x3c0\n ? handle_bug+0x53/0xa0\n ? exc_invalid_op+0x14/0x50\n ? asm_exc_invalid_op+0x16/0x20\n ? bnxt_rx_pkt+0x479b/0x7610\n ? bnxt_rx_pkt+0x3e41/0x7610\n ? __pfx_bnxt_rx_pkt+0x10/0x10\n ? napi_complete_done+0x2cf/0x7d0\n __bnxt_poll_work+0x4e8/0x1220\n ? __pfx___bnxt_poll_work+0x10/0x10\n ? __pfx_mark_lock.part.0+0x10/0x10\n bnxt_poll_p5+0x36a/0xfa0\n ? __pfx_bnxt_poll_p5+0x10/0x10\n __napi_poll.constprop.0+0xa0/0x440\n net_rx_action+0x899/0xd00\n...\n\nFollowing ping.py patch adds xdp-mb-pass case. so ping.py is going\nto be able to reproduce this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/44578bc6460b8fca530fc7bd5897c115d9bd27e2","https://git.kernel.org/stable/c/5b57ed14a1b85e7ab0074d9668a0baa6c94826c7","https://git.kernel.org/stable/c/c03e7d05aa0e2f7e9a9ce5ad8a12471a53f941dc","https://git.kernel.org/stable/c/e8e3e03d69f2420eaa578199a65d281c58867105","https://git.kernel.org/stable/c/ee086c8e775f9690282e3d26471dbcfd5dad5a6a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:00:57.946988208+00:00"},"epss":{"cve":"CVE-2025-21960","score":0.00532,"percentile":0.4501,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}