{"api_version":"1","generated_at":"2026-07-24T17:44:14+00:00","cve":"CVE-2026-63890","urls":{"html":"https://cve.report/CVE-2026-63890","api":"https://cve.report/api/cve/CVE-2026-63890.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63890","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63890"},"summary":{"title":"scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker","description":"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 >= 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 >= 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 >= sizeof(*desc) stayed true\nforever, blocking every subsequent FIP frame on that controller.\n\nTighten the outer dlen guard to also reject dlen < 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:06","updated_at":"2026-07-19 16:17:06"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738","name":"https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636","name":"https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260","name":"https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a","name":"https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948","name":"https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36","name":"https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a","name":"https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6","name":"https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63890","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63890","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 97c8389d54b9665c38105ea72a428a44b97ff2f6 d179949d2175d2857d1c3a275a22bea58bcc5d36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 97c8389d54b9665c38105ea72a428a44b97ff2f6 fda976f7390bb5d1e9b84ef11ebb17323038e0c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 97c8389d54b9665c38105ea72a428a44b97ff2f6 80a0cd307205236ca28aa49bc553f58edcb9bf3a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 97c8389d54b9665c38105ea72a428a44b97ff2f6 0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63890","cve":"CVE-2026-63890","epss":"0.002100000","percentile":"0.113700000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/scsi/fcoe/fcoe_ctlr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d179949d2175d2857d1c3a275a22bea58bcc5d36","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"fda976f7390bb5d1e9b84ef11ebb17323038e0c6","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"80a0cd307205236ca28aa49bc553f58edcb9bf3a","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"549859a1131052b07dff11a448e9f3221a40f260","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"14dd80a20a72ce334adcc2d67402360527065948","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"d537d29d51c8b808469e5adacf3e5a0092700738","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"},{"lessThan":"9eed1bd59937e6828b00d2f2dfef631d964f3636","status":"affected","version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/scsi/fcoe/fcoe_ctlr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.30"},{"lessThan":"2.6.30","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"2.6.30","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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 >= 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 >= 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 >= sizeof(*desc) stayed true\nforever, blocking every subsequent FIP frame on that controller.\n\nTighten the outer dlen guard to also reject dlen < 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"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:06","lastModifiedDate":"2026-07-19 16:17:06","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63890","Ordinal":"1","Title":"scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL wal","CVE":"CVE-2026-63890","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63890","Ordinal":"1","NoteData":"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 >= 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 >= 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 >= sizeof(*desc) stayed true\nforever, blocking every subsequent FIP frame on that controller.\n\nTighten the outer dlen guard to also reject dlen < 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.","Type":"Description","Title":"scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL wal"}]}}}