CVE-2026-63890: Linux kernel · scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 12 Nov 2026, 20:41 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to reject FIP descriptors with lengths smaller than the descriptor header size, preventing the infinite loop. Users should apply the official Linux kernel updates that include this patch. No other mitigations are indicated.
Description
A vulnerability in the Linux kernel's FCoE driver allows an unauthenticated Layer 2 peer on the FCoE control VLAN to cause a denial of service by sending a malformed FIP CVL frame with a zero-length non-critical descriptor. This causes an infinite loop in the descriptor processing code, hanging the controller and blocking subsequent frames.
References
- git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36 (opens in a new tab)
- git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6 (opens in a new tab)
- git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a (opens in a new tab)
- git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a (opens in a new tab)
- git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260 (opens in a new tab)
- git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948 (opens in a new tab)
- git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738 (opens in a new tab)
- git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636 (opens in a new tab)