Vulnerability-Lookup

GHSA-MWCX-XF66-XWQM

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

netdevsim: zero initialize struct iphdr in dummy sk_buff

Syzbot reports a KMSAN uninit-value originating from nsim_dev_trap_skb_build, with the allocation also being performed in the same function.

Fix this by calling skb_put_zero instead of skb_put to guarantee zero initialization of the whole IP header.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52985"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:09Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetdevsim: zero initialize struct iphdr in dummy sk_buff\n\nSyzbot reports a KMSAN uninit-value originating from\nnsim_dev_trap_skb_build, with the allocation also\nbeing performed in the same function.\n\nFix this by calling skb_put_zero instead of skb_put to\nguarantee zero initialization of the whole IP header.",
  "id": "GHSA-mwcx-xf66-xwqm",
  "modified": "2026-06-24T18:32:42Z",
  "published": "2026-06-24T18:32:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52985"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/175556c049eaec14efde8c6475e763b7579b9de7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b7b6ae0e93b8d512e208b1378d74af052e4f4e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35eaa6d8d6c2ee65e96f507add856e0eacf24591"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e2cfd0904976e701d7a76b86b694e72af230ab0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/750d0091bebf44975421268d37484ef87060d263"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/818f7673ed7f4a29d4b9cee8184c47d6e57162b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/978ca6ff789f1f19c03288ac20cc1f4774e88490"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc6002865e8c4fcf9e94975f7cf023448d8764e2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-52985 (GCVE-0-2026-52985)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-06-24 16:28

Title

netdevsim: zero initialize struct iphdr in dummy sk_buff

Summary

In the Linux kernel, the following vulnerability has been resolved: netdevsim: zero initialize struct iphdr in dummy sk_buff Syzbot reports a KMSAN uninit-value originating from nsim_dev_trap_skb_build, with the allocation also being performed in the same function. Fix this by calling skb_put_zero instead of skb_put to guarantee zero initialization of the whole IP header.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/175556c049eaec14e…
https://git.kernel.org/stable/c/6e2cfd0904976e701…
https://git.kernel.org/stable/c/1b7b6ae0e93b8d512…
https://git.kernel.org/stable/c/818f7673ed7f4a29d…
https://git.kernel.org/stable/c/978ca6ff789f1f19c…
https://git.kernel.org/stable/c/750d0091bebf44975…
https://git.kernel.org/stable/c/bc6002865e8c4fcf9…
https://git.kernel.org/stable/c/35eaa6d8d6c2ee65e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 175556c049eaec14efde8c6475e763b7579b9de7 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 6e2cfd0904976e701d7a76b86b694e72af230ab0 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 1b7b6ae0e93b8d512e208b1378d74af052e4f4e7 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 818f7673ed7f4a29d4b9cee8184c47d6e57162b4 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 978ca6ff789f1f19c03288ac20cc1f4774e88490 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 750d0091bebf44975421268d37484ef87060d263 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < bc6002865e8c4fcf9e94975f7cf023448d8764e2 (git) Affected: da58f90f11f597520f226caff1d3cfc115abedc9 , < 35eaa6d8d6c2ee65e96f507add856e0eacf24591 (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
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        {
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          "programFiles": [
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            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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            }
          ]
        }
      ],
      "cpeApplicability": [
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}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-MWCX-XF66-XWQM

CVE-2026-52985 (GCVE-0-2026-52985)

Tags

Sightings

Nomenclature