FKIE_CVE-2026-74305
Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Tighten cgroup storage cookie checks for prog arrays
The fix in commit abad3d0bad72 ("bpf: Fix oob access in cgroup local
storage") is still incomplete. The prog-array compatibility check
treats a program with no cgroup storage as compatible with any stored
storage cookie. This allows a storage-less program to bridge a tail
call chain between an entry program and a storage-using callee even
though cgroup local storage at runtime still follows the caller's
context, that is, A -> B(no storage) -> C(storage) path.
Requiring exact cookie equality would break the legitimate case of a
storage-less leaf program being tail called from a storage-using one.
Instead, only accept a zero storage cookie if the program cannot
perform tail calls itself. This keeps A -> B(no storage) working
while rejecting the A -> B(no storage) -> C(storage) bridge.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/bpf/core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "87177497cca90bf4fcfb759eb898560eb5b46a10",
"status": "affected",
"version": "c1c74584b9b4043c52e41fec415226e582d266a3",
"versionType": "git"
},
{
"lessThan": "1c762d28698483ce7c372091f34d86e4d4828652",
"status": "affected",
"version": "66da7cee78590259b400e51a70622ccd41da7bb2",
"versionType": "git"
},
{
"lessThan": "eb73056ce2a6f101ddd3bdba89af6b24ebffff85",
"status": "affected",
"version": "7acfa07c585e3d7a64654d38f0a5c762877d0b9b",
"versionType": "git"
},
{
"lessThan": "9ca06849c4239aa2d580c54651f8588c51cb398b",
"status": "affected",
"version": "41688d1fc5d163a6c2c0e95c0419e2cb31a44648",
"versionType": "git"
},
{
"lessThan": "46fbafe3d2d569d828e8d24a7dbe1659f63685cf",
"status": "affected",
"version": "abad3d0bad72a52137e0c350c59542d75ae4f513",
"versionType": "git"
},
{
"lessThan": "cb22dc79528eb26a46d346c3118dbd6b14c70609",
"status": "affected",
"version": "abad3d0bad72a52137e0c350c59542d75ae4f513",
"versionType": "git"
},
{
"lessThan": "10627ddc0167aab5c1c390a10ef461e9937aba08",
"status": "affected",
"version": "abad3d0bad72a52137e0c350c59542d75ae4f513",
"versionType": "git"
},
{
"status": "affected",
"version": "19341d5c59e8c7e8528e40f8663e99d67810473c",
"versionType": "git"
},
{
"lessThan": "5.15.212",
"status": "affected",
"version": "5.15.192",
"versionType": "semver"
},
{
"lessThan": "6.1.178",
"status": "affected",
"version": "6.1.151",
"versionType": "semver"
},
{
"lessThan": "6.6.145",
"status": "affected",
"version": "6.6.105",
"versionType": "semver"
},
{
"lessThan": "6.12.97",
"status": "affected",
"version": "6.12.46",
"versionType": "semver"
},
{
"lessThan": "6.17",
"status": "affected",
"version": "6.16.1",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/bpf/core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"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: Tighten cgroup storage cookie checks for prog arrays\n\nThe fix in commit abad3d0bad72 (\"bpf: Fix oob access in cgroup local\nstorage\") is still incomplete. The prog-array compatibility check\ntreats a program with no cgroup storage as compatible with any stored\nstorage cookie. This allows a storage-less program to bridge a tail\ncall chain between an entry program and a storage-using callee even\nthough cgroup local storage at runtime still follows the caller\u0027s\ncontext, that is, A -\u003e B(no storage) -\u003e C(storage) path.\n\nRequiring exact cookie equality would break the legitimate case of a\nstorage-less leaf program being tail called from a storage-using one.\nInstead, only accept a zero storage cookie if the program cannot\nperform tail calls itself. This keeps A -\u003e B(no storage) working\nwhile rejecting the A -\u003e B(no storage) -\u003e C(storage) bridge."
}
],
"id": "CVE-2026-74305",
"lastModified": "2026-08-17T06:19:24.653",
"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": "2026-08-15T06:22:30.190",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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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.
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.
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