CVE-2026-90358 (GCVE-0-2026-90358)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-10-30 12:35
VLAI
EPSS
VEX
Title
bpf, x86: Fix trampoline stack size for 128-bit arguments
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf, x86: Fix trampoline stack size for 128-bit arguments
btf_distill_func_proto() accepts a function argument up to 16 bytes, so a
128-bit scalar such as __int128 reaches the x86 trampoline with
arg_size == 16. But the current implementation assumes an __int128
argument only needs one register, so the register save area is
under-allocated and save_args() overwrites adjacent stack slots.
Compute the register count from arg_size for all arguments to fix it.
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 2189232984b45ac8281c80484ab9f67b380a2ca1
(git)
Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 7f96bf0d24b2acc0732906b60a10f06783f2470d (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 4aed2346fa9b88d458eeb8c01123f3c07585a675 (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 40f3bfbbb222b92278f3797614b70f68d46824ac (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < a6d7d7a253c550e74b0651897fe313c2f9b2301f (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 814cba835ef648e0c5eb79505c96c0493b29eea6 (git) |
guessed | |
| Linux | Linux |
Affected:
6.1
Unaffected: 0 , < 6.1 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 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 |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/net/bpf_jit_comp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2189232984b45ac8281c80484ab9f67b380a2ca1",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "7f96bf0d24b2acc0732906b60a10f06783f2470d",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "4aed2346fa9b88d458eeb8c01123f3c07585a675",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "40f3bfbbb222b92278f3797614b70f68d46824ac",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "a6d7d7a253c550e74b0651897fe313c2f9b2301f",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "814cba835ef648e0c5eb79505c96c0493b29eea6",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/x86/net/bpf_jit_comp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.1"
},
{
"lessThan": "6.1",
"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": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"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": "6.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "6.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.110",
"versionStartIncluding": "6.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.52",
"versionStartIncluding": "6.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "6.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "6.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, x86: Fix trampoline stack size for 128-bit arguments\n\nbtf_distill_func_proto() accepts a function argument up to 16 bytes, so a\n128-bit scalar such as __int128 reaches the x86 trampoline with\narg_size == 16. But the current implementation assumes an __int128\nargument only needs one register, so the register save area is\nunder-allocated and save_args() overwrites adjacent stack slots.\n\nCompute the register count from arg_size for all arguments to fix it."
}
],
"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 under-allocation is in __arch_prepare_bpf_trampoline()/save_args() in arch/x86/net/bpf_jit_comp.c and is reached only when a local process issues bpf(BPF_PROG_LOAD) for BPF_PROG_TYPE_TRACING fentry/fexit and bpf(BPF_LINK_CREATE) against a BTF function with a 16-byte integer argument. BPF is a local syscall vector, not a network protocol parser.\nAC:L - The attacker selects an attach target whose BTF has arg_size==16 without BTF_FMODEL_STRUCT_ARG (e.g. bpf_testmod_test_int128_arg). __arch_prepare_bpf_trampoline() then under-counts nr_regs by one slot per such argument and save_args() deterministically overwrites the next stack slot; no race or uninfluenced layout is required.\nPR:L - bpf_prog_load() rejects BPF_PROG_TYPE_TRACING unless bpf_token_capable(CAP_BPF) and, via is_perfmon_prog_type(), bpf_token_capable(CAP_PERFMON). Those capabilities are delegable with BPF tokens and are scored Low, not init-namespace root, consistent with other BPF trampoline CVEs.\nUI:N - The attacker loads the fentry/fexit program, attaches it with BPF_LINK_CREATE, and invokes the target themselves (for bpf_testmod, a read of the module sysfs test file that calls bpf_testmod_test_int128_arg). No separate victim mount or click is required.\nS:U - save_args() overwrites the trampoline\u0027s own saved RBP and adjacent slots in the host kernel stack. That is in-kernel memory corruption on the same authority, not a KVM/Xen guest-to-host, IOMMU, or sandbox boundary crossing.\nC:H - The extra 8-byte store of the __int128\u0027s second register (RSI) lands in adjacent trampoline slots. On an fentry trampoline without a return-value slot that is saved RBP, so leave pivots RSP through argument contents and subsequent pops/unwinds can disclose kernel stack/memory.\nI:H - The same OOB store overwrites saved RBP (and with two 16-byte scalars, the return address at RBP+8). The trampoline epilogue then executes leave; ret on a corrupted frame, which is kernel stack memory corruption exploitable for a stack pivot and control-flow hijack.\nA:H - Overwriting saved RBP with the high half of a small __int128 (0 for bpf_testmod_test_int128_arg((__int128)1,...)) makes leave load a bogus frame pointer, so the following pop/ret oopses or panics the kernel."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:35:20.664Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2189232984b45ac8281c80484ab9f67b380a2ca1"
},
{
"url": "https://git.kernel.org/stable/c/7f96bf0d24b2acc0732906b60a10f06783f2470d"
},
{
"url": "https://git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675"
},
{
"url": "https://git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac"
},
{
"url": "https://git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f"
},
{
"url": "https://git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6"
}
],
"title": "bpf, x86: Fix trampoline stack size for 128-bit arguments",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-90358",
"datePublished": "2026-09-17T16:09:03.531Z",
"dateReserved": "2026-09-11T19:38:34.806Z",
"dateUpdated": "2026-10-30T12:35:20.664Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-90358",
"date": "2026-11-10",
"epss": "0.00169",
"percentile": "0.06343"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/net/bpf_jit_comp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2189232984b45ac8281c80484ab9f67b380a2ca1",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "7f96bf0d24b2acc0732906b60a10f06783f2470d",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "4aed2346fa9b88d458eeb8c01123f3c07585a675",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "40f3bfbbb222b92278f3797614b70f68d46824ac",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "a6d7d7a253c550e74b0651897fe313c2f9b2301f",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
},
{
"lessThan": "814cba835ef648e0c5eb79505c96c0493b29eea6",
"status": "affected",
"version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/x86/net/bpf_jit_comp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.1"
},
{
"lessThan": "6.1",
"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": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"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, x86: Fix trampoline stack size for 128-bit arguments\n\nbtf_distill_func_proto() accepts a function argument up to 16 bytes, so a\n128-bit scalar such as __int128 reaches the x86 trampoline with\narg_size == 16. But the current implementation assumes an __int128\nargument only needs one register, so the register save area is\nunder-allocated and save_args() overwrites adjacent stack slots.\n\nCompute the register count from arg_size for all arguments to fix it."
}
],
"id": "CVE-2026-90358",
"lastModified": "2026-10-30T13:20:51.127",
"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": "2026-09-17T17:17:34.703",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2189232984b45ac8281c80484ab9f67b380a2ca1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7f96bf0d24b2acc0732906b60a10f06783f2470d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T01:41:27+00:00",
"cve": "CVE-2026-90358",
"id": "CVE-2026-90358",
"initial_release_date": "2026-09-17T00:00:00+00:00",
"product_status:known_affected": "110",
"product_status:known_not_affected": "93",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf, x86: Fix trampoline stack size for 128-bit arguments",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90358.json",
"version": "3"
}
}
}
Loading…
Loading…
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.
Loading timeline…
Loading…
Loading…
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.
Loading…
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.