CVE-2026-43086 (GCVE-0-2026-43086)
Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
ipvs: fix NULL deref in ip_vs_add_service error path
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipvs: fix NULL deref in ip_vs_add_service error path
When ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local
variable sched is set to NULL. If ip_vs_start_estimator() subsequently
fails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)
with sched == NULL. ip_vs_unbind_scheduler() passes the cur_sched NULL
check (because svc->scheduler was set by the successful bind) but then
dereferences the NULL sched parameter at sched->done_service, causing a
kernel panic at offset 0x30 from NULL.
Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)
Call Trace:
<TASK>
ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)
do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)
nf_setsockopt (net/netfilter/nf_sockopt.c:102)
[..]
Fix by simply not clearing the local sched variable after a successful
bind. ip_vs_unbind_scheduler() already detects whether a scheduler is
installed via svc->scheduler, and keeping sched non-NULL ensures the
error path passes the correct pointer to both ip_vs_unbind_scheduler()
and ip_vs_scheduler_put().
While the bug is older, the problem popups in more recent kernels (6.2),
when the new error path is taken after the ip_vs_start_estimator() call.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
705dd34440812735ece298eb5bc153fde9544d42 , < 730663352c9178f33fcf5929f4a37c1f1ca5a693
(git)
Affected: 705dd34440812735ece298eb5bc153fde9544d42 , < 4039959315008888dd53c37674d33351817a5166 (git) Affected: 705dd34440812735ece298eb5bc153fde9544d42 , < a32dabacee111cea083ddd57a03635672e1bff29 (git) Affected: 705dd34440812735ece298eb5bc153fde9544d42 , < c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94 (git) Affected: 705dd34440812735ece298eb5bc153fde9544d42 , < 9a91797e61d286805ae10a92cc48959c30800556 (git) |
||
{
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"programFiles": [
"net/netfilter/ipvs/ip_vs_ctl.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.136",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver"
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{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.19.14",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix NULL deref in ip_vs_add_service error path\n\nWhen ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local\nvariable sched is set to NULL. If ip_vs_start_estimator() subsequently\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\nwith sched == NULL. ip_vs_unbind_scheduler() passes the cur_sched NULL\ncheck (because svc-\u003escheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched-\u003edone_service, causing a\nkernel panic at offset 0x30 from NULL.\n\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\n Call Trace:\n \u003cTASK\u003e\n ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\n do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\n nf_setsockopt (net/netfilter/nf_sockopt.c:102)\n [..]\n\nFix by simply not clearing the local sched variable after a successful\nbind. ip_vs_unbind_scheduler() already detects whether a scheduler is\ninstalled via svc-\u003escheduler, and keeping sched non-NULL ensures the\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\nand ip_vs_scheduler_put().\n\nWhile the bug is older, the problem popups in more recent kernels (6.2),\nwhen the new error path is taken after the ip_vs_start_estimator() call."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-06T07:40:20.631Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693"
},
{
"url": "https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166"
},
{
"url": "https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29"
},
{
"url": "https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94"
},
{
"url": "https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556"
}
],
"title": "ipvs: fix NULL deref in ip_vs_add_service error path",
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43086",
"datePublished": "2026-05-06T07:40:20.631Z",
"dateReserved": "2026-05-01T14:12:55.983Z",
"dateUpdated": "2026-05-06T07:40:20.631Z",
"state": "PUBLISHED"
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"epss": {
"cve": "CVE-2026-43086",
"date": "2026-05-08",
"epss": "0.00018",
"percentile": "0.04875"
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-43086\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:21.837\",\"lastModified\":\"2026-05-06T13:08:07.970\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipvs: fix NULL deref in ip_vs_add_service error path\\n\\nWhen ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local\\nvariable sched is set to NULL. If ip_vs_start_estimator() subsequently\\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\\nwith sched == NULL. ip_vs_unbind_scheduler() passes the cur_sched NULL\\ncheck (because svc-\u003escheduler was set by the successful bind) but then\\ndereferences the NULL sched parameter at sched-\u003edone_service, causing a\\nkernel panic at offset 0x30 from NULL.\\n\\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\\n Call Trace:\\n \u003cTASK\u003e\\n ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\\n do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\\n nf_setsockopt (net/netfilter/nf_sockopt.c:102)\\n [..]\\n\\nFix by simply not clearing the local sched variable after a successful\\nbind. ip_vs_unbind_scheduler() already detects whether a scheduler is\\ninstalled via svc-\u003escheduler, and keeping sched non-NULL ensures the\\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\\nand ip_vs_scheduler_put().\\n\\nWhile the bug is older, the problem popups in more recent kernels (6.2),\\nwhen the new error path is taken after the ip_vs_start_estimator() call.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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