CVE-2024-40909 (GCVE-0-2024-40909)
Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2026-08-05 11:33
VLAI
EPSS
VEX
Title
bpf: Fix a potential use-after-free in bpf_link_free()
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix a potential use-after-free in bpf_link_free()
After commit 1a80dbcb2dba, bpf_link can be freed by
link->ops->dealloc_deferred, but the code still tests and uses
link->ops->dealloc afterward, which leads to a use-after-free as
reported by syzbot. Actually, one of them should be sufficient, so
just call one of them instead of both. Also add a WARN_ON() in case
of any problematic implementation.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:06 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
876941f533e7b47fc69977fc4551c02f2d18af97 , < 91cff53136daeff50816b0baeafd38a6976f6209
(git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < fa97b8fed9896f1e89cb657513e483a152d4c382 (git) Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < 2884dc7d08d98a89d8d65121524bb7533183a63a (git) Affected: 5d8d447777564b35f67000e7838e7ccb64d525c8 (git) Affected: 6.6.26 , < 6.6.35 (semver) Affected: 6.8.5 , < 6.9 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.6.35 , ≤ 6.6.* (semver) Unaffected: 6.9.6 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed |
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"product_status:known_not_affected": "170",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: Fix a potential use-after-free in bpf_link_free()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-40909.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-02T01:28:16Z",
"cve": "CVE-2024-40909",
"id": "CVE-2024-40909",
"initial_release_date": "2024-07-16T02:35:01Z",
"product_status:known_affected": "330",
"product_status:known_not_affected": "292",
"product_status:recommended": "667",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-40909",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-40909.json",
"version": "117"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T04:39:55.487Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-40909\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:06:09.099919Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:24.857Z\"}}], \"cna\": {\"title\": \"bpf: Fix a potential use-after-free in bpf_link_free()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"876941f533e7b47fc69977fc4551c02f2d18af97\", \"lessThan\": \"91cff53136daeff50816b0baeafd38a6976f6209\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce\", \"lessThan\": \"fa97b8fed9896f1e89cb657513e483a152d4c382\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce\", \"lessThan\": \"2884dc7d08d98a89d8d65121524bb7533183a63a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5d8d447777564b35f67000e7838e7ccb64d525c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6.6.26\", \"lessThan\": \"6.6.35\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.8.5\", \"lessThan\": \"6.9\", \"versionType\": \"semver\"}], \"programFiles\": [\"kernel/bpf/syscall.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.35\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/syscall.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209\"}, {\"url\": \"https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382\"}, {\"url\": \"https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix a potential use-after-free in bpf_link_free()\\n\\nAfter commit 1a80dbcb2dba, bpf_link can be freed by\\nlink-\u003eops-\u003edealloc_deferred, but the code still tests and uses\\nlink-\u003eops-\u003edealloc afterward, which leads to a use-after-free as\\nreported by syzbot. Actually, one of them should be sufficient, so\\njust call one of them instead of both. Also add a WARN_ON() in case\\nof any problematic implementation.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.35\", \"versionStartIncluding\": \"6.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.6\", \"versionStartIncluding\": \"6.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"6.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.8.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:50:39.144Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-40909\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:50:39.144Z\", \"dateReserved\": \"2024-07-12T12:17:45.580Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:48.447Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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