CVE-2026-43238 (GCVE-0-2026-43238)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-05-11 22:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash() Commit 38a6f0865796 ("net: sched: support hash selecting tx queue") added SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is computed as: mapping_mod = queue_mapping_max - queue_mapping + 1; The range size can be 65536 when the requested range covers all possible u16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX). That value cannot be represented in a u16 and previously wrapped to 0, so tcf_skbedit_hash() could trigger a divide-by-zero: queue_mapping += skb_get_hash(skb) % params->mapping_mod; Compute mapping_mod in a wider type and reject ranges larger than U16_MAX to prevent params->mapping_mod from becoming 0 and avoid the crash.
References
Impacted products
Vendor Product Version
Linux Linux Version: 38a6f0865796e26fc38fff4858f681d9ae76fa0f
Version: 38a6f0865796e26fc38fff4858f681d9ae76fa0f
Version: 38a6f0865796e26fc38fff4858f681d9ae76fa0f
Version: 38a6f0865796e26fc38fff4858f681d9ae76fa0f
Version: 38a6f0865796e26fc38fff4858f681d9ae76fa0f
Version: 38a6f0865796e26fc38fff4858f681d9ae76fa0f
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()\n\nCommit 38a6f0865796 (\"net: sched: support hash selecting tx queue\")\nadded SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is\ncomputed as:\n\nmapping_mod = queue_mapping_max - queue_mapping + 1;\n\nThe range size can be 65536 when the requested range covers all possible\nu16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX).\nThat value cannot be represented in a u16 and previously wrapped to 0,\nso tcf_skbedit_hash() could trigger a divide-by-zero:\n\nqueue_mapping += skb_get_hash(skb) % params-\u003emapping_mod;\n\nCompute mapping_mod in a wider type and reject ranges larger than U16_MAX\nto prevent params-\u003emapping_mod from becoming 0 and avoid the crash."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:20:40.634Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/59809fda4da7730cfe84a948033f47eb45db073d"
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          "url": "https://git.kernel.org/stable/c/9c735a7d98c982a786b0db71eb6566ee00aaa04f"
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        },
        {
          "url": "https://git.kernel.org/stable/c/be054cc66f739a9ba615dba9012a07fab8e7dd6f"
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      "title": "net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43238",
    "datePublished": "2026-05-06T11:28:32.950Z",
    "dateReserved": "2026-05-01T14:12:55.995Z",
    "dateUpdated": "2026-05-11T22:20:40.634Z",
    "state": "PUBLISHED"
  },
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}


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