CVE-2026-63890
scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker
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.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 27, 2026, 5:44 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Apply the security patch for the FCoE driver.
- Reboot the affected system if necessary.
- Verify the patch has been applied.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63890.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63890 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63890
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63890 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63890 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': 'd179949d2175d2857d1c3a275a22bea58bcc5d36', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': 'fda976f7390bb5d1e9b84ef11ebb17323038e0c6', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': '80a0cd307205236ca28aa49bc553f58edcb9bf3a', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': '0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': '549859a1131052b07dff11a448e9f3221a40f260', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': '14dd80a20a72ce334adcc2d67402360527065948', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': 'd537d29d51c8b808469e5adacf3e5a0092700738', 'versionType': 'git'}, {'status': 'affected', 'version': '97c8389d54b9665c38105ea72a428a44b97ff2f6', 'lessThan': '9eed1bd59937e6828b00d2f2dfef631d964f3636', 'versionType': 'git'}], 'programFiles': ['drivers/scsi/fcoe/fcoe_ctlr.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.30'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.30', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/scsi/fcoe/fcoe_ctlr.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a Added Reference https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948 Added Reference https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260 Added Reference https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a Added Reference https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636 Added Reference https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36 Added Reference https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738 Added Reference https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6