CVE-2024-36020 (GCVE-0-2024-36020)
Vulnerability from cvelistv5
Published
2024-05-30 14:59
Modified
2026-08-05 11:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: i40e: fix vf may be used uninitialized in this function warning To fix the regression introduced by commit 52424f974bc5, which causes servers hang in very hard to reproduce conditions with resets races. Using two sources for the information is the root cause. In this function before the fix bumping v didn't mean bumping vf pointer. But the code used this variables interchangeably, so stale vf could point to different/not intended vf. Remove redundant "v" variable and iterate via single VF pointer across whole function instead to guarantee VF pointer validity.
References
Impacted products
Vendor Product Version
Linux Linux Version: 76ed715836c6994bac29d9638e9314e6e3b08651
Version: e88c2a1e28c5475065563d66c07ca879a9afbd07
Version: 9abae363af5ced6adbf04c14366289540281fb26
Version: c39de3ae5075ea5f78e097cb5720d4e52d5caed9
Version: 52424f974bc53c26ba3f00300a00e9de9afcd972
Version: 52424f974bc53c26ba3f00300a00e9de9afcd972
Version: 52424f974bc53c26ba3f00300a00e9de9afcd972
Version: 52424f974bc53c26ba3f00300a00e9de9afcd972
Version: 02f949747e6fb767b29f7931d4bbf40911684e7a
Version: 4.19.264   ≤
Version: 5.4.223   ≤
Version: 5.10.153   ≤
Version: 5.15.77   ≤
Version: 6.0.7   ≤
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A freed-and-reallocated VSI that is still dereferenced gives an attacker who sprays the slab a kernel-memory read primitive.\\nI:H - The same double-free/UAF lets attacker-controlled heap data occupy the freed `i40e_vsi`, whose fields (ring pointers, q_vector arrays, `pf-\u003evsi[]` slot) are subsequently written and dereferenced, providing a write primitive suitable for control-flow hijack. The mis-gated cleanup also lets HW register programming and resource accounting be applied to the wrong VF.\\nA:H - The upstream author states the bug hangs servers: when the stale pointer reports RESETTING, `i40e_cleanup_reset_vf()` is skipped for every VF, leaving all VFs wedged in reset with `VPGEN_VFRTRIG` asserted and no `VFACTIVE` handshake, killing networking for every guest on the adapter. 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      "cveMetadata": "{\"cveId\": \"CVE-2024-36020\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:31:40.320Z\", \"dateReserved\": \"2024-05-17T13:50:33.157Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-30T14:59:44.447Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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