RHSA-2026:92063
Vulnerability from csaf_redhat - Published: 2026-10-28 18:40 - Updated: 2026-10-29 20:52Summary
Red Hat Security Advisory: kpatch-patch-4_18_0-477_107_1, kpatch-patch-4_18_0-477_120_1, kpatch-patch-4_18_0-477_130_1, kpatch-patch-4_18_0-477_143_1, and kpatch-patch-4_18_0-477_161_1 security update
Severity
Important
Notes
Topic: An update for multiple packages is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-477.107.1.el8_8.
Security Fix(es):
* kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266)
* kernel: pppoe: reload header pointer after dev_hard_header() (CVE-2026-68121)
* kernel: net: bridge: stop fast-leave after deleting a port group (CVE-2026-74480)
* kernel: packet: use consistent hard_header_len in non-ring send paths (CVE-2026-74582)
* kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the Linux kernel's netfilter bridge ebtables SNAT (Source Network Address Translation) module. This vulnerability allows a local attacker on a system configured with specific bridge netfilter rules to improperly modify underlying memory pages during an ARP (Address Resolution Protocol) sender hardware address rewrite. This could lead to unintended system behavior, a denial of service, or potentially local privilege escalation, where an attacker gains higher access rights than intended.
7.5 (High)
Affected products
Fixed
35 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-0:1-17.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-0:1-17.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-0:1-17.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-debuginfo-0:1-17.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-debuginfo-0:1-17.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-debugsource-0:1-17.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_107_1-debugsource-0:1-17.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-0:1-16.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-0:1-16.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-0:1-16.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-debuginfo-0:1-16.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-debuginfo-0:1-16.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-debugsource-0:1-16.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_120_1-debugsource-0:1-16.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-0:1-14.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-0:1-14.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-0:1-14.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-debuginfo-0:1-14.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-debuginfo-0:1-14.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-debugsource-0:1-14.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_130_1-debugsource-0:1-14.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-0:1-10.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-0:1-10.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-0:1-10.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-debuginfo-0:1-10.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-debuginfo-0:1-10.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-debugsource-0:1-10.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_143_1-debugsource-0:1-10.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-0:1-3.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-0:1-3.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-0:1-3.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-debuginfo-0:1-3.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-debuginfo-0:1-3.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-debugsource-0:1-3.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:kpatch-patch-4_18_0-477_161_1-debugsource-0:1-3.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Exploit Status
CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Impact
Important
A flaw was found in the Linux kernel's PPPoE (Point-to-Point Protocol over Ethernet) implementation. This vulnerability occurs because a pointer to network packet data is not updated after memory is reallocated, leading to the use of an outdated memory address. An attacker with local access could potentially trigger this condition, causing memory corruption. This could result in a system crash (denial of service) or other unpredictable system behavior.
7.3 (High)
Affected products
Fixed
35 products, the same list as for
CVE-2026-53266
Threats
Impact
Important
A flaw was found in the Linux kernel's network bridge module. When handling multicast fast-leave, a vulnerability exists where the system may attempt to access a port group after it has been deleted. This can occur if multicast-to-unicast was previously enabled and then disabled, leading to a stale pointer. This memory corruption vulnerability could lead to system instability or a denial of service.
7.8 (High)
Affected products
Fixed
35 products, the same list as for
CVE-2026-53266
Threats
Impact
Important
An out-of-bounds write problem was observed in packet_sendmsg_spkt in net/packet/af_packet.c in the Linux Kernel. In this flaw, AF_PACKET hard_header_len race may allow local privilege escalation.
7.8 (High)
Affected products
Fixed
35 products, the same list as for
CVE-2026-53266
Threats
Impact
Important
A flaw was found in the Linux kernel's xfrm subsystem, specifically within the AH6 (Authentication Header for IPv6) module. The `ipv6_rearrange_rthdr()` function does not properly validate the `segments_left` field in routing headers when processing raw IPv6 HDRINCL packets. This oversight allows an attacker to craft a malicious packet that can cause an out-of-bounds memory access, potentially leading to memory corruption.
8.3 (High)
Affected products
Fixed
35 products, the same list as for
CVE-2026-53266
Threats
Impact
Important
References
35 references
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"text": "An Important flaw in the Linux kernel\u0027s ebtables SNAT target allows a local attacker to achieve privilege escalation, memory corruption, or denial of service. This vulnerability requires specific bridge netfilter rules to be configured, limiting its impact to systems with such specialized network configurations.",
"title": "Statement"
},
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"text": "A flaw was found in the Linux kernel\u0027s PPPoE (Point-to-Point Protocol over Ethernet) implementation. This vulnerability occurs because a pointer to network packet data is not updated after memory is reallocated, leading to the use of an outdated memory address. An attacker with local access could potentially trigger this condition, causing memory corruption. This could result in a system crash (denial of service) or other unpredictable system behavior.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: pppoe: reload header pointer after dev_hard_header()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513233"
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{
"category": "external",
"summary": "RHSB-2026-011",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-011"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-68121",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-68121"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-68121",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68121"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026081056-CVE-2026-68121-b20f@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026081056-CVE-2026-68121-b20f@gregkh/T"
}
],
"release_date": "2026-08-10T11:58:41.489000+00:00",
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"title": "kernel: pppoe: reload header pointer after dev_hard_header()"
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{
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"name": "Expired Pointer Dereference"
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"ids": [
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{
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"text": "A flaw was found in the Linux kernel\u0027s network bridge module. When handling multicast fast-leave, a vulnerability exists where the system may attempt to access a port group after it has been deleted. This can occur if multicast-to-unicast was previously enabled and then disabled, leading to a stale pointer. This memory corruption vulnerability could lead to system instability or a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net: bridge: stop fast-leave after deleting a port group",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "If the multicast-to-unicast feature has not been explicitly enabled on any bridge port (it is disabled by default), the vulnerable code path cannot be reached. Systems that do not use Linux bridge interfaces - for example, systems that are not acting as hypervisors, container hosts, or network gateways - are not affected by this flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-74480"
},
{
"category": "external",
"summary": "RHBZ#2517046",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517046"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-74480",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-74480"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-74480",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74480"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026081536-CVE-2026-74480-e620@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026081536-CVE-2026-74480-e620@gregkh/T"
}
],
"release_date": "2026-08-15T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-28T18:40:07+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"title": "kernel: net: bridge: stop fast-leave after deleting a port group"
},
{
"cve": "CVE-2026-74582",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-08-19T10:09:54.050000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2519475"
}
],
"notes": [
{
"category": "description",
"text": "An out-of-bounds write problem was observed in packet_sendmsg_spkt in net/packet/af_packet.c in the Linux Kernel. In this flaw, AF_PACKET hard_header_len race may allow local privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: packet: use consistent hard_header_len in non-ring send paths",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"title": "kernel: packet: use consistent hard_header_len in non-ring send paths"
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{
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{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s xfrm subsystem, specifically within the AH6 (Authentication Header for IPv6) module. The `ipv6_rearrange_rthdr()` function does not properly validate the `segments_left` field in routing headers when processing raw IPv6 HDRINCL packets. This oversight allows an attacker to craft a malicious packet that can cause an out-of-bounds memory access, potentially leading to memory corruption.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: xfrm: ah6: validate routing header segments_left",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is classified as Important severity because exploitation can be achieved by a local attacker with unprivileged user access. An attack could leverage user namespaces to obtain elevated network permissions within the namespace, then sends specially crafted IPv6 packets with malformed Authentication Header routing headers. Exploitation is challenging but achievable due to complex setup including IPv6 AH/XFRM, ESP-in-UDP encapsulation, and specific timing and memory layout conditions. This memory corruption can enable local privilege escalation to root from an unprivileged user account.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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{
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"date": "2026-10-28T18:40:07+00:00",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:92063"
},
{
"category": "workaround",
"details": "See the security bulletin for a detailed mitigation procedure.",
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"confidentialityImpact": "HIGH",
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"scope": "UNCHANGED",
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],
"title": "kernel: xfrm: ah6: validate routing header segments_left"
}
]
}
Loading…
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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.