CVE-2026-63890 (GCVE-0-2026-63890)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < d179949d2175d2857d1c3a275a22bea58bcc5d36 (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < fda976f7390bb5d1e9b84ef11ebb17323038e0c6 (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < 80a0cd307205236ca28aa49bc553f58edcb9bf3a (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < 0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < 549859a1131052b07dff11a448e9f3221a40f260 (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < 14dd80a20a72ce334adcc2d67402360527065948 (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < d537d29d51c8b808469e5adacf3e5a0092700738 (git)
Affected: 97c8389d54b9665c38105ea72a428a44b97ff2f6 , < 9eed1bd59937e6828b00d2f2dfef631d964f3636 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker\n\ndrivers/scsi/fcoe/fcoe_ctlr.c::fcoe_ctlr_recv_clr_vlink() advanced the\ndescriptor cursor by an attacker-supplied fip_dlen without ever\nrequiring dlen \u003e= sizeof(struct fip_desc) in the default branch.  The\nnamed descriptor cases (FIP_DT_MAC, FIP_DT_NAME, FIP_DT_VN_ID) checked\ntheir per-type minimum lengths, but a FIP_DT_NON_CRITICAL descriptor\n(fip_dtype \u003e= 128, which the standard requires receivers to silently\nignore) skipped that check entirely.\n\nAn unauthenticated L2 peer on the FCoE control VLAN could hang\nfcoe_ctlr_recv_work on an fcoe, qedf, or bnx2fc initiator indefinitely\nby emitting one FIP CVL frame whose single descriptor had fip_dtype ==\nFIP_DT_NON_CRITICAL and fip_dlen == 0: the cursor advanced zero bytes\nper iteration and the loop condition rlen \u003e= sizeof(*desc) stayed true\nforever, blocking every subsequent FIP frame on that controller.\n\nTighten the outer dlen guard to also reject dlen \u003c sizeof(struct\nfip_desc), so a malformed descriptor whose length cannot even cover the\ndescriptor header is rejected before the switch.  This is the same\nlower-bound the named cases already apply and is the minimum scope that\ncloses the loop."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:02.195Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
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          "url": "https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a"
        },
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        },
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          "url": "https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260"
        },
        {
          "url": "https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948"
        },
        {
          "url": "https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738"
        },
        {
          "url": "https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636"
        }
      ],
      "title": "scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "datePublished": "2026-07-19T14:55:02.195Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
    "dateUpdated": "2026-07-19T14:55:02.195Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker\n\ndrivers/scsi/fcoe/fcoe_ctlr.c::fcoe_ctlr_recv_clr_vlink() advanced the\ndescriptor cursor by an attacker-supplied fip_dlen without ever\nrequiring dlen \u003e= sizeof(struct fip_desc) in the default branch.  The\nnamed descriptor cases (FIP_DT_MAC, FIP_DT_NAME, FIP_DT_VN_ID) checked\ntheir per-type minimum lengths, but a FIP_DT_NON_CRITICAL descriptor\n(fip_dtype \u003e= 128, which the standard requires receivers to silently\nignore) skipped that check entirely.\n\nAn unauthenticated L2 peer on the FCoE control VLAN could hang\nfcoe_ctlr_recv_work on an fcoe, qedf, or bnx2fc initiator indefinitely\nby emitting one FIP CVL frame whose single descriptor had fip_dtype ==\nFIP_DT_NON_CRITICAL and fip_dlen == 0: the cursor advanced zero bytes\nper iteration and the loop condition rlen \u003e= sizeof(*desc) stayed true\nforever, blocking every subsequent FIP frame on that controller.\n\nTighten the outer dlen guard to also reject dlen \u003c sizeof(struct\nfip_desc), so a malformed descriptor whose length cannot even cover the\ndescriptor header is rejected before the switch.  This is the same\nlower-bound the named cases already apply and is the minimum scope that\ncloses the loop."
          }
        ],
        "id": "CVE-2026-63890",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {},
        "published": "2026-07-19T16:17:06.300",
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            "url": "https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-07T13:42:45+00:00",
      "cve": "CVE-2026-63890",
      "id": "CVE-2026-63890",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63890.json",
      "version": "3"
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.