CVE-2026-89799 (GCVE-0-2026-89799)
Vulnerability from cvelistv5 – Published: 2026-09-16 10:30 – Updated: 2026-10-30 12:33
VLAI
EPSS
VEX
Title
bpf: Disable preemption in bpf_get_stackid
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Disable preemption in bpf_get_stackid
The get_perf_callchain call needs disabled preemption plus we need
it disabled as long as we access its returned trace entries buffer.
Note the bpf_get_stackid_pe function is executed already with
preemption disabled.
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d5a3b1f691865be576c2bffa708549b8cdccda19 , < 01fc93f670b3e759413a4d574c18ccfc636d2728
(git)
Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < e79a70c2e97ae36bbdd371f0ce88a525f7b49f01 (git) Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < 18c71e4b65ee60b8611fc071bdd7159f10185117 (git) Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < ccf481d73bce6e851cec364fe831c86fe66877cf (git) Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf (git) Affected: d5a3b1f691865be576c2bffa708549b8cdccda19 , < 15f1bd8574662f1b7b26aaa2e23ebf4066f0117d (git) |
guessed | |
| Linux | Linux |
Affected:
4.6
Unaffected: 0 , < 4.6 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/bpf/stackmap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
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{
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"versionType": "git"
},
{
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"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
},
{
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"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
}
]
},
{
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"product": "Linux",
"programFiles": [
"kernel/bpf/stackmap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"lessThan": "4.6",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "4.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "4.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.111",
"versionStartIncluding": "4.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.51",
"versionStartIncluding": "4.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.5",
"versionStartIncluding": "4.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "4.6",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disable preemption in bpf_get_stackid\n\nThe get_perf_callchain call needs disabled preemption plus we need\nit disabled as long as we access its returned trace entries buffer.\n\nNote the bpf_get_stackid_pe function is executed already with\npreemption disabled."
}
],
"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 - bpf_get_stackid is a tracing BPF helper (kprobe, tracepoint, raw_tp, perf_event, tracing/fentry) reached only after a local bpf(2) PROG_LOAD and attach; kernel CNA guidance classifies BPF as Local, with no network or USB path into this helper.\nAC:L - The attacker controls both sides of the race: a preemptible raw_tp/tracing program with a small STACK_TRACE map, and a same-CPU get_perf_callchain with larger max_depth that reuses the per-CPU entry after put_callchain_entry(). On PREEMPT kernels (e.g. Android) raw_tp uses migrate_disable only, so pinning and retries make the window reliably hittable.\nPR:L - Loading the required tracing programs needs CAP_BPF and CAP_PERFMON at bpf_prog_load(), and STACK_TRACE maps need CAP_BPF. Per kernel CNA guidance these are Low because BPF tokens and user namespaces can delegate them to non-init-namespace users, not only real root.\nUI:N - The attacker loads their own BPF program, attaches it to a tracepoint they can fire, and invokes bpf_get_stackid through their own syscalls or pinned threads; no victim mount, file open, or other user action is required.\nS:U - The out-of-bounds write corrupts the stack-map bucket slab inside the same host kernel security authority, enabling local privilege escalation; it does not cross a VM, IOMMU, or other distinct trust boundary.\nC:H - After put_callchain_entry(), a reused per-CPU entry can inflate trace-\u003enr so memcpy/jhash2 and the build-id loop copy kernel instruction pointers past the attacker-sized stack_map_bucket, which is kernel memory corruption that can be turned into an arbitrary read primitive.\nI:H - Without a remaining size cap on the reused trace-\u003enr, memcpy into the preallocated stack_map_bucket (sized to a small map value_size) or the bpf_stack_build_id store loop is an attacker-sized kernel heap OOB write, up to PERF_MAX_STACK_DEPTH frames, that can smash adjacent slab and hijack control flow.\nA:H - The same unbounded heap write past a small stack-map bucket causes a kernel oops or panic even when not fully weaponized, matching CNA guidance that any kernel crash or memory-corrupting OOB write is Availability High."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:33:04.585Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/01fc93f670b3e759413a4d574c18ccfc636d2728"
},
{
"url": "https://git.kernel.org/stable/c/e79a70c2e97ae36bbdd371f0ce88a525f7b49f01"
},
{
"url": "https://git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117"
},
{
"url": "https://git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf"
},
{
"url": "https://git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf"
},
{
"url": "https://git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d"
}
],
"title": "bpf: Disable preemption in bpf_get_stackid",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89799",
"datePublished": "2026-09-16T10:30:31.487Z",
"dateReserved": "2026-09-11T19:38:34.767Z",
"dateUpdated": "2026-10-30T12:33:04.585Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-89799",
"date": "2026-11-10",
"epss": "0.00175",
"percentile": "0.07046"
},
"microsoft_vex": {
"current_release_date": "2026-11-07T01:49:35.000Z",
"cve": "CVE-2026-89799",
"id": "msrc_CVE-2026-89799",
"initial_release_date": "2026-09-17T01:13:16.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "4",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "bpf: Disable preemption in bpf_get_stackid",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89799.json",
"version": "8"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/bpf/stackmap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "01fc93f670b3e759413a4d574c18ccfc636d2728",
"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
},
{
"lessThan": "e79a70c2e97ae36bbdd371f0ce88a525f7b49f01",
"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
},
{
"lessThan": "ccf481d73bce6e851cec364fe831c86fe66877cf",
"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
},
{
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"versionType": "git"
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{
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"status": "affected",
"version": "d5a3b1f691865be576c2bffa708549b8cdccda19",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"lessThan": "4.6",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disable preemption in bpf_get_stackid\n\nThe get_perf_callchain call needs disabled preemption plus we need\nit disabled as long as we access its returned trace entries buffer.\n\nNote the bpf_get_stackid_pe function is executed already with\npreemption disabled."
}
],
"id": "CVE-2026-89799",
"lastModified": "2026-10-30T13:20:29.443",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-09-16T11:16:44.767",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/01fc93f670b3e759413a4d574c18ccfc636d2728"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e79a70c2e97ae36bbdd371f0ce88a525f7b49f01"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T01:23:50+00:00",
"cve": "CVE-2026-89799",
"id": "CVE-2026-89799",
"initial_release_date": "2026-09-16T00:00:00+00:00",
"product_status:known_affected": "189",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: Disable preemption in bpf_get_stackid",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89799.json",
"version": "3"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
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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
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They have not been verified by an analyst and are provided for guidance only.
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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.