CVE-2020-36791 (GCVE-0-2020-36791)

Vulnerability from cvelistv5 – Published: 2025-05-07 13:17 – Updated: 2025-05-07 14:12
VLAI?
Title
net_sched: keep alloc_hash updated after hash allocation
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: keep alloc_hash updated after hash allocation In commit 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex") I moved cp->hash calculation before the first tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched. This difference could lead to another out of bound access. cp->alloc_hash should always be the size allocated, we should update it after this tcindex_alloc_perfect_hash().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 73c29d2f6f8ae731b1e09051b69ed3ba2319482b , < d6cdc5bb19b595486fb2e6661e5138d73a57f454 (git)
Affected: b974ac51f5834a729de252fc5c1c9de9efd79b45 , < c4453d2833671e3a9f6bd52f0f581056c3736386 (git)
Affected: 6cb448ee493c8a514c9afa0c346f3f5b3227de85 , < 9f8b6c44be178c2498a00b270872a6e30e7c8266 (git)
Affected: 478c4b2ffd44e5186c7e22ae7c38a86a5b9cfde5 , < 557d015ffb27b672e24e6ad141fd887783871dc2 (git)
Affected: dd8142a6fa5270783d415292ec8169f4ea2a5468 , < d23faf32e577922b6da20bf3740625c1105381bf (git)
Affected: 2c66ff8d08f81bcf8e8cb22e31e39c051b15336a , < bd3ee8fb6371b45c71c9345cc359b94da2ddefa9 (git)
Affected: 599be01ee567b61f4471ee8078870847d0a11e8e , < 0d1c3530e1bd38382edef72591b78e877e0edcd3 (git)
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    Linux Linux Affected: 4.4.214 , < 4.4.218 (semver)
Affected: 4.9.214 , < 4.9.218 (semver)
Affected: 4.14.171 , < 4.14.175 (semver)
Affected: 4.19.103 , < 4.19.114 (semver)
Affected: 5.4.19 , < 5.4.29 (semver)
Affected: 5.5.3 , < 5.5.14 (semver)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: keep alloc_hash updated after hash allocation\n\nIn commit 599be01ee567 (\"net_sched: fix an OOB access in cls_tcindex\")\nI moved cp-\u003ehash calculation before the first\ntcindex_alloc_perfect_hash(), but cp-\u003ealloc_hash is left untouched.\nThis difference could lead to another out of bound access.\n\ncp-\u003ealloc_hash should always be the size allocated, we should\nupdate it after this tcindex_alloc_perfect_hash()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-07T14:12:46.187Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386"
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          "url": "https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2"
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          "url": "https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf"
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          "url": "https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3"
        },
        {
          "url": "https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534"
        },
        {
          "url": "https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html"
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      ],
      "title": "net_sched: keep alloc_hash updated after hash allocation",
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    "cveId": "CVE-2020-36791",
    "datePublished": "2025-05-07T13:17:33.882Z",
    "dateReserved": "2024-02-26T17:07:27.435Z",
    "dateUpdated": "2025-05-07T14:12:46.187Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • 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.
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  • 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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