CVE-2026-43306 (GCVE-0-2026-43306)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-05-08 13:11
VLAI?
Title
bpf: crypto: Use the correct destructor kfunc type
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: crypto: Use the correct destructor kfunc type With CONFIG_CFI enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. I ran into the following type mismatch when running BPF self-tests: CFI failure at bpf_obj_free_fields+0x190/0x238 (target: bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc) Internal error: Oops - CFI: 00000000f2008228 [#1] SMP ... As bpf_crypto_ctx_release() is also used in BPF programs and using a void pointer as the argument would make the verifier unhappy, add a simple stub function with the correct type and register it as the destructor kfunc instead.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4e3e57dbf46dad3498f8c4219ce2dba756875962 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 50d6fd69388cc7b05dce72f09080674dcede4ac9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3979a550fe06b370d73647f59cf462fa525c9ec4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b40a5d724f29fc2eed23ff353808a9aae616b48a (git)
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    Linux Linux Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: crypto: Use the correct destructor kfunc type\n\nWith CONFIG_CFI enabled, the kernel strictly enforces that indirect\nfunction calls use a function pointer type that matches the target\nfunction. I ran into the following type mismatch when running BPF\nself-tests:\n\n  CFI failure at bpf_obj_free_fields+0x190/0x238 (target:\n    bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc)\n  Internal error: Oops - CFI: 00000000f2008228 [#1]  SMP\n  ...\n\nAs bpf_crypto_ctx_release() is also used in BPF programs and using\na void pointer as the argument would make the verifier unhappy, add\na simple stub function with the correct type and register it as the\ndestructor kfunc instead."
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    "cveId": "CVE-2026-43306",
    "datePublished": "2026-05-08T13:11:25.624Z",
    "dateReserved": "2026-05-01T14:12:56.000Z",
    "dateUpdated": "2026-05-08T13:11:25.624Z",
    "state": "PUBLISHED"
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.