CVE-2026-63890
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.
Leer descripción completaMostrar menos
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.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.23%
- Percentil entre todas las CVEs puntuadas: 12
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0e3c6e5a8fc15a74dfb1e0c1df9f1da73600a81a
- https://git.kernel.org/stable/c/14dd80a20a72ce334adcc2d67402360527065948
- https://git.kernel.org/stable/c/549859a1131052b07dff11a448e9f3221a40f260
- https://git.kernel.org/stable/c/80a0cd307205236ca28aa49bc553f58edcb9bf3a
- https://git.kernel.org/stable/c/9eed1bd59937e6828b00d2f2dfef631d964f3636
- https://git.kernel.org/stable/c/d179949d2175d2857d1c3a275a22bea58bcc5d36
- https://git.kernel.org/stable/c/d537d29d51c8b808469e5adacf3e5a0092700738
- https://git.kernel.org/stable/c/fda976f7390bb5d1e9b84ef11ebb17323038e0c6
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-63890",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "97c8389d54b9665c38105ea72a428a44b97ff2f6",
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"versionType": "git"
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{
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"versionType": "git"
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{
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"versionType": "git"
},
{
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{
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{
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{
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"versionType": "git"
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],
"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"
}
]
}
],
"published": "2026-07-19T16:17:06.300",
"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"
}
],
"vulnStatus": "Awaiting Analysis",
"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."
}
],
"lastModified": "2026-07-27T17:44:23.777",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}