CVE-2026-98611 (GCVE-0-2026-98611)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
bpf: Check params size before reading reserved fields
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Check params size before reading reserved fields bpf_crypto_ctx_create() is a kfunc whose second argument is declared with the __sz annotation, so the verifier only guarantees that params__sz bytes of params are valid. The function nevertheless reads params->reserved[0] and params->reserved[1] (offsets 14 and 15) before comparing params__sz against the size of struct bpf_crypto_params, so a BPF program can pass a shorter buffer and have the kernel read past the region that was validated for it. Move the size check in front of the reserved field reads.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a (git)
Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < cd12d3e08620257fbcaa262785d7f4b9473afc7a (git)
Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < 86a0e945fb645ea90233fde239cd2de79f01974c (git)
Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < a11212910cf09b2fe8db9afa41ef60c4f81879c5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check params size before reading reserved fields\n\nbpf_crypto_ctx_create() is a kfunc whose second argument is declared\nwith the __sz annotation, so the verifier only guarantees that\nparams__sz bytes of params are valid.  The function nevertheless reads\nparams-\u003ereserved[0] and params-\u003ereserved[1] (offsets 14 and 15) before\ncomparing params__sz against the size of struct bpf_crypto_params, so a\nBPF program can pass a shorter buffer and have the kernel read past the\nregion that was validated for it.\n\nMove the size check in front of the reserved field reads."
        }
      ],
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        "shortName": "Linux"
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    "datePublished": "2026-10-18T15:19:26.922Z",
    "dateReserved": "2026-09-25T10:25:14.360Z",
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    "state": "PUBLISHED"
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      "percentile": "0.06053"
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      "id": "msrc_CVE-2026-98611",
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      "product_status:under_investigation": "1",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check params size before reading reserved fields\n\nbpf_crypto_ctx_create() is a kfunc whose second argument is declared\nwith the __sz annotation, so the verifier only guarantees that\nparams__sz bytes of params are valid.  The function nevertheless reads\nparams-\u003ereserved[0] and params-\u003ereserved[1] (offsets 14 and 15) before\ncomparing params__sz against the size of struct bpf_crypto_params, so a\nBPF program can pass a shorter buffer and have the kernel read past the\nregion that was validated for it.\n\nMove the size check in front of the reserved field reads."
          }
        ],
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        "lastModified": "2026-10-19T10:19:23.283",
        "metrics": {},
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}



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