github - ghsa-v89r-8c65-6vgh

GHSA-V89R-8C65-6VGH

Vulnerability from github – Published: 2024-07-12 15:31 – Updated: 2024-08-29 15:30

Details

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)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-40909"
  ],
  "database_specific": {
    "cwe_ids": [
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-12T13:15:14Z",
    "severity": "HIGH"
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  "details": "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.",
  "id": "GHSA-v89r-8c65-6vgh",
  "modified": "2024-08-29T15:30:31Z",
  "published": "2024-07-12T15:31:27Z",
  "references": [
    {
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40909"
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      "type": "CVSS_V3"
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}

CVE-2024-40909 (GCVE-0-2024-40909)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2025-05-04 12:57

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 ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/91cff53136daeff50…
	https://git.kernel.org/stable/c/fa97b8fed9896f1e8…
	https://git.kernel.org/stable/c/2884dc7d08d98a89d…

Impacted products

Vendor

Product

Version

Linux

Affected: 876941f533e7b47fc69977fc4551c02f2d18af97 , < 91cff53136daeff50816b0baeafd38a6976f6209 (git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < fa97b8fed9896f1e89cb657513e483a152d4c382 (git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < 2884dc7d08d98a89d8d65121524bb7533183a63a (git)
Affected: 5d8d447777564b35f67000e7838e7ccb64d525c8 (git)

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)

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Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-V89R-8C65-6VGH

CVE-2024-40909 (GCVE-0-2024-40909)

Tags

Sightings

Nomenclature