CVE-2026-90293 (GCVE-0-2026-90293)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-10-19 09:01
VLAI
EPSS
VEX
Title
IB/isert: post the full-feature receive buffers after session registration
Summary
In the Linux kernel, the following vulnerability has been resolved:
IB/isert: post the full-feature receive buffers after session registration
isert_put_login_tx() posts the full-feature receive buffers before
__transport_register_session() runs, so an initiator that does not wait
for the final Login Response can still have a SCSI command executed
against an se_session whose se_tpg is NULL - the same oops as the
previous patch, at target_submit+0xbe.
Post them from isert_get_rx_pdu(), which the previous patch already uses
to send that response, and post them before that send: the receive queue
is filled at the moment the initiator is told it may use it. Allocating
there keeps the existing property that a memory allocation failure cannot
happen once the final Login Response is on the wire.
The receive queue is already empty between the final Login Request and
isert_post_recvm(); this moves the second point later, from a median of
92 us to 172 us over 1200 logins. Only an initiator that sends before it
has been told to can reach that window, and on IB and RoCE its send is
retried there until the buffers appear - isert_rdma_accept() asks for
rnr_retry_count = 7. iWARP has no RNR flow control, so there the same
send terminates the connection instead.
Measured over rxe, 400 login cycles per run, with an initiator that does
not wait: an instrumented build counted no entries to isert_recv_done()
before the buffers are posted in 10 runs, where that initiator oopsed
8 of 10 unpatched runs and 5 of 10 with only the previous patch.
Not tested: iWARP, discovery sessions over iSER, and real HCAs.
Severity
7.5 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b8d26b3be8b33682cf163274ed07479a70554633 , < 962edb9a6b0dae09d33a677485a398fc7d55968c
(git)
Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 068fe9841d2585b79d479fc7b58251d02d0b066f (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < d4f8257c3283919ca7e149381d062b9af5f7df7d (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 9c21a433022219ca899d1b3cd9049991f51a6a2c (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 9b2c61344992c8c2b883e1eebe416cc488a19390 (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 6c506fee5a5f2c8719c65bcfc5e5d0862b0a1946 (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < ad4492dcaf90a1d1a728ec5eef1a68ce5355027a (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 5247dde9daac7e107853b6fea043f7f47be033f7 (git) |
guessed | |
| Linux | Linux |
Affected:
3.10
Unaffected: 0 , < 3.10 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: post the full-feature receive buffers after session registration\n\nisert_put_login_tx() posts the full-feature receive buffers before\n__transport_register_session() runs, so an initiator that does not wait\nfor the final Login Response can still have a SCSI command executed\nagainst an se_session whose se_tpg is NULL - the same oops as the\nprevious patch, at target_submit+0xbe.\n\nPost them from isert_get_rx_pdu(), which the previous patch already uses\nto send that response, and post them before that send: the receive queue\nis filled at the moment the initiator is told it may use it. Allocating\nthere keeps the existing property that a memory allocation failure cannot\nhappen once the final Login Response is on the wire.\n\nThe receive queue is already empty between the final Login Request and\nisert_post_recvm(); this moves the second point later, from a median of\n92 us to 172 us over 1200 logins. Only an initiator that sends before it\nhas been told to can reach that window, and on IB and RoCE its send is\nretried there until the buffers appear - isert_rdma_accept() asks for\nrnr_retry_count = 7. iWARP has no RNR flow control, so there the same\nsend terminates the connection instead.\n\nMeasured over rxe, 400 login cycles per run, with an initiator that does\nnot wait: an instrumented build counted no entries to isert_recv_done()\nbefore the buffers are posted in 10 runs, where that initiator oopsed\n8 of 10 unpatched runs and 5 of 10 with only the previous patch.\n\nNot tested: iWARP, discovery sessions over iSER, and real HCAs."
}
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"value": "AV:N - The trigger is an ISCSI_OP_SCSI_CMD RDMA Send that isert_recv_done() handles after isert_put_login_tx() has already called isert_post_recvm() on the full-feature RQ; those Sends arrive from a remote initiator on the QP accepted by isert_connect_request() after rdma_listen() in isert_setup_id(), which binds RoCEv2 (UDP/IP) or iWARP (TCP).\nAC:L - The initiator drives login until login_complete so isert_put_login_tx() posts RX buffers, then sends ISCSI_OP_SCSI_CMD without waiting for the Login Response; isert_rdma_accept() sets rnr_retry_count=7 so IB/RoCE retries that Send until the RQ is filled and isert_recv_done() runs on ib-comp-wq before iscsi_post_login_handler() calls __transport_register_session().\nPR:N - login_complete is set in iscsi_target_do_login CSG1 only after iscsi_conn_authenticated(); when tpg_attrib.authentication is 0, iscsi_handle_authentication() accepts AuthMethod=None with no secret, and generate_node_acls demo mode lets core_tpg_check_initiator_node_acl() admit a client-asserted InitiatorName.\nUI:N - The attacker is the iSER initiator that finishes the Login Request exchange and posts the early SCSI Command on its own QP; no local user or administrator action is required.\nS:U - The NULL se_sess-\u003ese_tpg load in target_submit() oopses the same kernel that runs ib_isert; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - transport_alloc_session() kmem_cache_zallocs se_session so se_tpg stays NULL until __transport_register_session(); target_submit() only loads se_tpg-\u003ese_tpg_tfo and takes a GPF, with no out-of-bounds read.\nI:N - The fault is a NULL load of se_cmd-\u003ese_sess-\u003ese_tpg in target_submit(); this path does not write kernel memory or reuse a freed object.\nA:H - KASAN reports a null-ptr-deref in target_submit() on ib-comp-wq (ib_cq_poll_work \u2192 isert_recv_done \u2192 iscsit_process_scsi_cmd \u2192 iscsit_execute_cmd), producing a kernel oops."
}
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}
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: post the full-feature receive buffers after session registration\n\nisert_put_login_tx() posts the full-feature receive buffers before\n__transport_register_session() runs, so an initiator that does not wait\nfor the final Login Response can still have a SCSI command executed\nagainst an se_session whose se_tpg is NULL - the same oops as the\nprevious patch, at target_submit+0xbe.\n\nPost them from isert_get_rx_pdu(), which the previous patch already uses\nto send that response, and post them before that send: the receive queue\nis filled at the moment the initiator is told it may use it. Allocating\nthere keeps the existing property that a memory allocation failure cannot\nhappen once the final Login Response is on the wire.\n\nThe receive queue is already empty between the final Login Request and\nisert_post_recvm(); this moves the second point later, from a median of\n92 us to 172 us over 1200 logins. Only an initiator that sends before it\nhas been told to can reach that window, and on IB and RoCE its send is\nretried there until the buffers appear - isert_rdma_accept() asks for\nrnr_retry_count = 7. iWARP has no RNR flow control, so there the same\nsend terminates the connection instead.\n\nMeasured over rxe, 400 login cycles per run, with an initiator that does\nnot wait: an instrumented build counted no entries to isert_recv_done()\nbefore the buffers are posted in 10 runs, where that initiator oopsed\n8 of 10 unpatched runs and 5 of 10 with only the previous patch.\n\nNot tested: iWARP, discovery sessions over iSER, and real HCAs."
}
],
"id": "CVE-2026-90293",
"lastModified": "2026-10-19T09:19:23.113",
"metrics": {
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
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"published": "2026-09-17T17:17:26.543",
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T01:35:41+00:00",
"cve": "CVE-2026-90293",
"id": "CVE-2026-90293",
"initial_release_date": "2026-09-17T00:00:00+00:00",
"product_status:known_affected": "189",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: IB/isert: post the full-feature receive buffers after session registration",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90293.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.