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CVE-2026-63890— scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.30版本存在安全漏洞，该漏洞源于fcoe_ctlr_recv_clr_vlink()函数对FIP描述符的fip_dlen字段未进行充分验证，可能导致未经验证的L2攻击者通过发送特制的FIP CVL帧使FCoE控制无限循环，进而阻塞后续所有FIP帧。

AI Predicted 7.5 Difficulty: Easy EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 97c8389d54b9665c38105ea72a428a44b97ff2f6< d179949d2175d2857d1c3a275a22bea58bcc5d36 affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< fda976f7390bb5d1e9b84ef11ebb17323038e0c6 affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< 80a0cd307205236ca28aa49bc553f58edcb9bf3a affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< 0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< 549859a1131052b07dff11a448e9f3221a40f260 affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< 14dd80a20a72ce334adcc2d67402360527065948 affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< d537d29d51c8b808469e5adacf3e5a0092700738 affected
97c8389d54b9665c38105ea72a428a44b97ff2f6< 9eed1bd59937e6828b00d2f2dfef631d964f3636 affected
… +10 more rows
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I. Basic Information for CVE-2026-63890

Vulnerability Information
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Vulnerability Title
scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker drivers/scsi/fcoe/fcoe_ctlr.c::fcoe_ctlr_recv_clr_vlink() advanced the descriptor cursor by an attacker-supplied fip_dlen without ever requiring dlen >= sizeof(struct fip_desc) in the default branch. The named descriptor cases (FIP_DT_MAC, FIP_DT_NAME, FIP_DT_VN_ID) checked their per-type minimum lengths, but a FIP_DT_NON_CRITICAL descriptor (fip_dtype >= 128, which the standard requires receivers to silently ignore) skipped that check entirely. An unauthenticated L2 peer on the FCoE control VLAN could hang fcoe_ctlr_recv_work on an fcoe, qedf, or bnx2fc initiator indefinitely by emitting one FIP CVL frame whose single descriptor had fip_dtype == FIP_DT_NON_CRITICAL and fip_dlen == 0: the cursor advanced zero bytes per iteration and the loop condition rlen >= sizeof(*desc) stayed true forever, blocking every subsequent FIP frame on that controller. Tighten the outer dlen guard to also reject dlen < sizeof(struct fip_desc), so a malformed descriptor whose length cannot even cover the descriptor header is rejected before the switch. This is the same lower-bound the named cases already apply and is the minimum scope that closes the loop.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.30版本存在安全漏洞，该漏洞源于fcoe_ctlr_recv_clr_vlink()函数对FIP描述符的fip_dlen字段未进行充分验证，可能导致未经验证的L2攻击者通过发送特制的FIP CVL帧使FCoE控制无限循环，进而阻塞后续所有FIP帧。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 97c8389d54b9665c38105ea72a428a44b97ff2f6 ~ d179949d2175d2857d1c3a275a22bea58bcc5d36 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-63890

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III. Intelligence Information for CVE-2026-63890

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Patches & Fixes for CVE-2026-63890 (6)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63890

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