{"id":"CVE-2026-63890","state":"PUBLISHED","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.","publishedAt":"2026-07-19T14:55:02.195Z","updatedAt":"2026-07-19T14:55:02.195Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"d179949d2175d2857d1c3a275a22bea58bcc5d36","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"fda976f7390bb5d1e9b84ef11ebb17323038e0c6","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"80a0cd307205236ca28aa49bc553f58edcb9bf3a","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"549859a1131052b07dff11a448e9f3221a40f260","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"14dd80a20a72ce334adcc2d67402360527065948","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"d537d29d51c8b808469e5adacf3e5a0092700738","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"9eed1bd59937e6828b00d2f2dfef631d964f3636","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/fcoe/fcoe_ctlr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/fcoe/fcoe_ctlr.c"]}],"references":["https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36","https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6","https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a","https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a","https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260","https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948","https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738","https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63890.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63890","state":"PUBLISHED","datePublished":"2026-07-19T14:55:02.195Z","dateUpdated":"2026-07-19T14:55:02.195Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.018Z"},"containers":{"cna":{"title":"scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"d179949d2175d2857d1c3a275a22bea58bcc5d36","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"fda976f7390bb5d1e9b84ef11ebb17323038e0c6","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"80a0cd307205236ca28aa49bc553f58edcb9bf3a","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"549859a1131052b07dff11a448e9f3221a40f260","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"14dd80a20a72ce334adcc2d67402360527065948","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"d537d29d51c8b808469e5adacf3e5a0092700738","versionType":"git"},{"version":"97c8389d54b9665c38105ea72a428a44b97ff2f6","status":"affected","lessThan":"9eed1bd59937e6828b00d2f2dfef631d964f3636","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/fcoe/fcoe_ctlr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/fcoe/fcoe_ctlr.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T14:55:02.195Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}