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
References
Impacted products
Vendor Product Version
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)
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)
Create a notification for this product.
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{
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          "vendor": "Linux",
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              "version": "2.6.30"
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              "version": "0",
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            },
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              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.12.93",
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              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.210",
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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": [
        {
          "url": "https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36"
        },
        {
          "url": "https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a"
        },
        {
          "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63890",
    "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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      "date": "2026-07-21",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/fcoe/fcoe_ctlr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/fcoe/fcoe_ctlr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.