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BELL-CVE-2024-26852 (CVE-2024-26852)
Vulnerability from osv_bellsoft – Published: 2024-04-18 05:58 – Updated: 2024-04-18 05:58 – Source website
VLAI
Severity
7.8 (High)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"package": {
"ecosystem": "Alpaquita:23",
"name": "linux-lts",
"purl": "pkg:apk/alpaquita/linux-lts?arch=source\u0026distro=23"
},
"ranges": [
{
"events": [
{
"introduced": "6.1.81-r0"
},
{
"fixed": "6.1.82-r0"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Alpaquita:25",
"name": "linux-lts",
"purl": "pkg:apk/alpaquita/linux-lts?arch=source\u0026distro=25"
},
"ranges": [
{
"events": [
{
"introduced": "6.6.89-r0"
},
{
"fixed": "6.12.41-r0"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Alpaquita:stream",
"name": "linux-lts",
"purl": "pkg:apk/alpaquita/linux-lts?arch=source\u0026distro=stream"
},
"ranges": [
{
"events": [
{
"introduced": "6.6.100-r0"
},
{
"fixed": "6.12.41-r0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"id": "BELL-CVE-2024-26852",
"modified": "2024-04-18T05:58:34.480549Z",
"published": "2024-04-18T05:58:34.480547Z",
"references": [
{
"type": "ADVISORY",
"url": "https://docs.bell-sw.com/security/cves/CVE-2024-26852"
}
],
"schema_version": "1.7.4",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"upstream": [
"CVE-2024-26852"
]
}
CVE-2024-26852 (GCVE-0-2024-26852)
Vulnerability from cvelistv5 – Published: 2024-04-17 10:17 – Updated: 2026-08-05 11:27
VLAI
EPSS
VEX
Title
net/ipv6: avoid possible UAF in ip6_route_mpath_notify()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/ipv6: avoid possible UAF in ip6_route_mpath_notify()
syzbot found another use-after-free in ip6_route_mpath_notify() [1]
Commit f7225172f25a ("net/ipv6: prevent use after free in
ip6_route_mpath_notify") was not able to fix the root cause.
We need to defer the fib6_info_release() calls after
ip6_route_mpath_notify(), in the cleanup phase.
[1]
BUG: KASAN: slab-use-after-free in rt6_fill_node+0x1460/0x1ac0
Read of size 4 at addr ffff88809a07fc64 by task syz-executor.2/23037
CPU: 0 PID: 23037 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x167/0x540 mm/kasan/report.c:488
kasan_report+0x142/0x180 mm/kasan/report.c:601
rt6_fill_node+0x1460/0x1ac0
inet6_rt_notify+0x13b/0x290 net/ipv6/route.c:6184
ip6_route_mpath_notify net/ipv6/route.c:5198 [inline]
ip6_route_multipath_add net/ipv6/route.c:5404 [inline]
inet6_rtm_newroute+0x1d0f/0x2300 net/ipv6/route.c:5517
rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367
netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
___sys_sendmsg net/socket.c:2638 [inline]
__sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f73dd87dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f73de6550c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f73dd9ac050 RCX: 00007f73dd87dda9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 00007f73dd8ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f73dd9ac050 R15: 00007ffdbdeb7858
</TASK>
Allocated by task 23037:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:3981 [inline]
__kmalloc+0x22e/0x490 mm/slub.c:3994
kmalloc include/linux/slab.h:594 [inline]
kzalloc include/linux/slab.h:711 [inline]
fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3758
ip6_route_multipath_add net/ipv6/route.c:5298 [inline]
inet6_rtm_newroute+0x744/0x2300 net/ipv6/route.c:5517
rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367
netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
___sys_sendmsg net/socket.c:2638 [inline]
__sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
Freed by task 16:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640
poison_slab_object+0xa6/0xe0 m
---truncated---
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-19 20:41 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
11 references
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
3b1137fe74829e021f483756a648cbb87c8a1b4a , < 31ea5bcc7d4cd1423de6be327a2c034725704136
(git)
Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < 664f9c647260cc9d68b4e31d9899530d89dd045e (git) Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < 79ce2e54cc0ae366f45516c00bf1b19aa43e9abe (git) Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < cae3303257950d03ffec2df4a45e836f10d26c24 (git) Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < 394334fe2ae3b9f1e2332b873857e84cb28aac18 (git) Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < ed883060c38721ed828061f6c0c30e5147326c9a (git) Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < 61b34f73cdbdb8eaf9ea12e9e2eb3b29716c4dda (git) Affected: 3b1137fe74829e021f483756a648cbb87c8a1b4a , < 685f7d531264599b3f167f1e94bbd22f120e5fab (git) |
|
| Linux | Linux |
Affected:
4.11
Unaffected: 0 , < 4.11 (semver) Unaffected: 4.19.310 , ≤ 4.19.* (semver) Unaffected: 5.4.272 , ≤ 5.4.* (semver) Unaffected: 5.10.213 , ≤ 5.10.* (semver) Unaffected: 5.15.152 , ≤ 5.15.* (semver) Unaffected: 6.1.82 , ≤ 6.1.* (semver) Unaffected: 6.6.22 , ≤ 6.6.* (semver) Unaffected: 6.7.10 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix) |
|
| linux | linux_kernel |
Affected:
3b1137fe7482 , < 31ea5bcc7d4c
(custom)
Affected: 3b1137fe7482 , < 664f9c647260 (custom) Affected: 3b1137fe7482 , < 79ce2e54cc0a (custom) Affected: 3b1137fe7482 , < cae330325795 (custom) Affected: 3b1137fe7482 , < 394334fe2ae3 (custom) Affected: 3b1137fe7482 , < ed883060c387 (custom) Affected: 3b1137fe7482 , < 61b34f73cdbd (custom) Affected: 3b1137fe7482 , < 685f7d531264 (custom) Affected: 4.11 Unaffected: 0 , < 4.11 (custom) Unaffected: 4.19.310 , ≤ 4.20 (custom) Unaffected: 5.4.272 , ≤ 5.5 (custom) Unaffected: 5.10.213 , ≤ 5.11 (custom) Unaffected: 5.15.152 , ≤ 5.16 (custom) Unaffected: 6.1.82 , ≤ 6.2 (custom) Unaffected: 6.6.22 , ≤ 6.7 (custom) Unaffected: 6.7.10 , ≤ 6.8 (custom) Unaffected: 6.8 , ≤ * (custom) cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
|
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
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"cpeApplicability": [
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.82",
"versionStartIncluding": "4.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.22",
"versionStartIncluding": "4.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.7.10",
"versionStartIncluding": "4.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8",
"versionStartIncluding": "4.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: avoid possible UAF in ip6_route_mpath_notify()\n\nsyzbot found another use-after-free in ip6_route_mpath_notify() [1]\n\nCommit f7225172f25a (\"net/ipv6: prevent use after free in\nip6_route_mpath_notify\") was not able to fix the root cause.\n\nWe need to defer the fib6_info_release() calls after\nip6_route_mpath_notify(), in the cleanup phase.\n\n[1]\nBUG: KASAN: slab-use-after-free in rt6_fill_node+0x1460/0x1ac0\nRead of size 4 at addr ffff88809a07fc64 by task syz-executor.2/23037\n\nCPU: 0 PID: 23037 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x167/0x540 mm/kasan/report.c:488\n kasan_report+0x142/0x180 mm/kasan/report.c:601\n rt6_fill_node+0x1460/0x1ac0\n inet6_rt_notify+0x13b/0x290 net/ipv6/route.c:6184\n ip6_route_mpath_notify net/ipv6/route.c:5198 [inline]\n ip6_route_multipath_add net/ipv6/route.c:5404 [inline]\n inet6_rtm_newroute+0x1d0f/0x2300 net/ipv6/route.c:5517\n rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597\n netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367\n netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n ___sys_sendmsg net/socket.c:2638 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\nRIP: 0033:0x7f73dd87dda9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f73de6550c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007f73dd9ac050 RCX: 00007f73dd87dda9\nRDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005\nRBP: 00007f73dd8ca47a R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 000000000000006e R14: 00007f73dd9ac050 R15: 00007ffdbdeb7858\n \u003c/TASK\u003e\n\nAllocated by task 23037:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:372 [inline]\n __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389\n kasan_kmalloc include/linux/kasan.h:211 [inline]\n __do_kmalloc_node mm/slub.c:3981 [inline]\n __kmalloc+0x22e/0x490 mm/slub.c:3994\n kmalloc include/linux/slab.h:594 [inline]\n kzalloc include/linux/slab.h:711 [inline]\n fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155\n ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3758\n ip6_route_multipath_add net/ipv6/route.c:5298 [inline]\n inet6_rtm_newroute+0x744/0x2300 net/ipv6/route.c:5517\n rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597\n netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367\n netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n ___sys_sendmsg net/socket.c:2638 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nFreed by task 16:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640\n poison_slab_object+0xa6/0xe0 m\n---truncated---"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is triggered by an RTM_NEWROUTE message sent over an AF_NETLINK/NETLINK_ROUTE socket via sendmsg(), which requires local access to the system. There is no remote packet-processing path into ip6_route_multipath_add().\nAC:L - The attacker creates both sides of the condition: they drop the last reference themselves and can widen the window arbitrarily by supplying many nexthops, by setting RTA_EXPIRES=0 so the non-rtnl gc softirq reaps the route, and by lowering net.ipv6.route.gc_interval inside their own netns, with unlimited retries. syzbot reproduced it, confirming reliable triggerability.\nPR:L - rtnetlink_rcv_msg() only requires netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the network namespace\u0027s user namespace, so any unprivileged local user obtains it with `unshare -Urn`. Multipath ECMP routes are addable in that namespace using RTNH_F_ONLINK gateways, which bypasses gateway reachability validation.\nUI:N - The entire sequence is performed by the attacker\u0027s own process in a single netlink transaction; no victim action, mount, or other interaction is needed.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - rt6_fill_node() reads the freed kmalloc-512 fib6_info and copies its contents into an RTM_NEWROUTE netlink message returned to the attacker\u0027s socket, including dereferencing pointers taken from freed memory such as rt-\u003efib6_metrics (passed to rtnetlink_put_metrics()), rt-\u003efib6_table, and rt-\u003efib6_nh. Reclaiming the freed slot with controlled data turns this into an arbitrary kernel-memory read leaked directly to userspace.\nI:H - This is a use-after-free on a 512-byte kmalloc object that an unprivileged attacker can spray and reclaim, after which the kernel dereferences attacker-controlled pointers and performs a list_for_each_entry_safe() walk over the freed fib6_siblings list head. That yields controlled pointer traversal and corruption suitable for privilege escalation.\nA:H - The KASAN slab-use-after-free in rt6_fill_node() causes an oops/panic when the freed object is unmapped, poisoned, or reclaimed with invalid pointers, and it can be triggered repeatedly to reliably crash the kernel."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:27:48.147Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/31ea5bcc7d4cd1423de6be327a2c034725704136"
},
{
"url": "https://git.kernel.org/stable/c/664f9c647260cc9d68b4e31d9899530d89dd045e"
},
{
"url": "https://git.kernel.org/stable/c/79ce2e54cc0ae366f45516c00bf1b19aa43e9abe"
},
{
"url": "https://git.kernel.org/stable/c/cae3303257950d03ffec2df4a45e836f10d26c24"
},
{
"url": "https://git.kernel.org/stable/c/394334fe2ae3b9f1e2332b873857e84cb28aac18"
},
{
"url": "https://git.kernel.org/stable/c/ed883060c38721ed828061f6c0c30e5147326c9a"
},
{
"url": "https://git.kernel.org/stable/c/61b34f73cdbdb8eaf9ea12e9e2eb3b29716c4dda"
},
{
"url": "https://git.kernel.org/stable/c/685f7d531264599b3f167f1e94bbd22f120e5fab"
}
],
"title": "net/ipv6: avoid possible UAF in ip6_route_mpath_notify()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-26852",
"datePublished": "2024-04-17T10:17:15.923Z",
"dateReserved": "2024-02-19T14:20:24.183Z",
"dateUpdated": "2026-08-05T11:27:48.147Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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.
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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.
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