CVE-2026-99225 (GCVE-0-2026-99225)

Vulnerability from cvelistv5 – Published: 2026-11-02 16:06 – Updated: 2026-11-03 19:12
VLAI
Title
keys: Check the authorization payload in process keyring searches
Summary
In the Linux kernel, the following vulnerability has been resolved: keys: Check the authorization payload in process keyring searches An authorization payload and its saved credentials must remain valid while search_process_keyrings_rcu() searches the requestor's keyrings. The function validates the authorization key, then separately loads payload.data[0] and unconditionally reads rka->cred. Validation does not prevent request_key_auth_revoke() from clearing the payload. A request-key helper can assume authority and fork a descendant that inherits the authorization key. If the descendant misses in its own keyrings, it falls back to the saved requestor credentials. Successful target instantiation invalidates the authorization key without clearing the payload. After the helper exits, UMH_WAIT_PROC returns to the requester, which calls complete_request_key() and revokes that key. With the descendant paused after validation, the paths can interleave as follows: 1. The descendant enters search_process_keyrings_rcu() under RCU and key_validate() succeeds. 2. The helper instantiates the target, invalidates the authorization key, and exits. 3. The requester resumes from UMH_WAIT_PROC, calls complete_request_key(), and revokes the authorization key. request_key_auth_revoke() sets its payload pointer to NULL. 4. The descendant loads NULL and dereferences rka->cred. This NULL dereference can oops the kernel. RCU delays payload disposal but does not prevent the pointer from being cleared. Load the payload with dereference_key_rcu() and require a non-NULL result before validating the authorization key and searching its saved credentials. A non-NULL payload and its credentials remain alive for the caller's RCU read-side section; a cleared payload skips the fallback search and follows the existing error selection. KASAN report as below: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] RIP: 0010:search_process_keyrings_rcu+0x32b/0x790
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 14fb6fad526b35a7ebd121f1dd313abe652e0aa6 (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 458cf9715af6aff3ac8d2ec60bd59e9d6236fd0f (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 7d3d2fffe933e538472ccafe5bbc7109488b9ce3 (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 26949c2e4c461e9e620e935bc22717f36a40b615 (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 984a178d54515779a1bee100b92a6cee8777c830 (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < b86db7993051d05810601654e886a1e78e1fa495 (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < b4dfda438fee3c6faa15d9b421c373de6a0e476f (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 49f4e768540d25d8852ef750313afda6a4774871 (git)
Affected: e59428f721ee096d8a020504ea908a6f0d952735 , < 0a0ec45bf577a9b4d4960567f20d3877ef480de9 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.60 , ≤ 6.18.* (semver)
Unaffected: 7.2.14 , ≤ 7.2.* (semver)
Unaffected: 7.3.1 , ≤ 7.3.* (semver)
Unaffected: 7.4-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Check the authorization payload in process keyring searches\n\nAn authorization payload and its saved credentials must remain valid\nwhile search_process_keyrings_rcu() searches the requestor\u0027s keyrings.\nThe function validates the authorization key, then separately loads\npayload.data[0] and unconditionally reads rka-\u003ecred. Validation does\nnot prevent request_key_auth_revoke() from clearing the payload.\n\nA request-key helper can assume authority and fork a descendant that\ninherits the authorization key. If the descendant misses in its own\nkeyrings, it falls back to the saved requestor credentials. Successful\ntarget instantiation invalidates the authorization key without clearing\nthe payload. After the helper exits, UMH_WAIT_PROC returns to the\nrequester, which calls complete_request_key() and revokes that key.\n\nWith the descendant paused after validation, the paths can interleave\nas follows:\n\n  1. The descendant enters search_process_keyrings_rcu() under RCU and\n     key_validate() succeeds.\n  2. The helper instantiates the target, invalidates the authorization\n     key, and exits.\n  3. The requester resumes from UMH_WAIT_PROC, calls\n     complete_request_key(), and revokes the authorization key.\n     request_key_auth_revoke() sets its payload pointer to NULL.\n  4. The descendant loads NULL and dereferences rka-\u003ecred.\n\nThis NULL dereference can oops the kernel. RCU delays payload disposal\nbut does not prevent the pointer from being cleared.\n\nLoad the payload with dereference_key_rcu() and require a non-NULL\nresult before validating the authorization key and searching its saved\ncredentials. A non-NULL payload and its credentials remain alive for\nthe caller\u0027s RCU read-side section; a cleared payload skips the fallback\nsearch and follows the existing error selection.\n\nKASAN report as below:\n\n    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI\n    KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\n    RIP: 0010:search_process_keyrings_rcu+0x32b/0x790"
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    "datePublished": "2026-11-02T16:06:34.759Z",
    "dateReserved": "2026-09-25T10:25:14.402Z",
    "dateUpdated": "2026-11-03T19:12:58.334Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Check the authorization payload in process keyring searches\n\nAn authorization payload and its saved credentials must remain valid\nwhile search_process_keyrings_rcu() searches the requestor\u0027s keyrings.\nThe function validates the authorization key, then separately loads\npayload.data[0] and unconditionally reads rka-\u003ecred. Validation does\nnot prevent request_key_auth_revoke() from clearing the payload.\n\nA request-key helper can assume authority and fork a descendant that\ninherits the authorization key. If the descendant misses in its own\nkeyrings, it falls back to the saved requestor credentials. Successful\ntarget instantiation invalidates the authorization key without clearing\nthe payload. After the helper exits, UMH_WAIT_PROC returns to the\nrequester, which calls complete_request_key() and revokes that key.\n\nWith the descendant paused after validation, the paths can interleave\nas follows:\n\n  1. The descendant enters search_process_keyrings_rcu() under RCU and\n     key_validate() succeeds.\n  2. The helper instantiates the target, invalidates the authorization\n     key, and exits.\n  3. The requester resumes from UMH_WAIT_PROC, calls\n     complete_request_key(), and revokes the authorization key.\n     request_key_auth_revoke() sets its payload pointer to NULL.\n  4. The descendant loads NULL and dereferences rka-\u003ecred.\n\nThis NULL dereference can oops the kernel. RCU delays payload disposal\nbut does not prevent the pointer from being cleared.\n\nLoad the payload with dereference_key_rcu() and require a non-NULL\nresult before validating the authorization key and searching its saved\ncredentials. A non-NULL payload and its credentials remain alive for\nthe caller\u0027s RCU read-side section; a cleared payload skips the fallback\nsearch and follows the existing error selection.\n\nKASAN report as below:\n\n    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI\n    KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\n    RIP: 0010:search_process_keyrings_rcu+0x32b/0x790"
          }
        ],
        "id": "CVE-2026-99225",
        "lastModified": "2026-11-03T20:18:28.023",
        "metrics": {},
        "published": "2026-11-02T16:17:47.047",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0a0ec45bf577a9b4d4960567f20d3877ef480de9"
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            "url": "https://git.kernel.org/stable/c/26949c2e4c461e9e620e935bc22717f36a40b615"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/458cf9715af6aff3ac8d2ec60bd59e9d6236fd0f"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7d3d2fffe933e538472ccafe5bbc7109488b9ce3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/984a178d54515779a1bee100b92a6cee8777c830"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b4dfda438fee3c6faa15d9b421c373de6a0e476f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b86db7993051d05810601654e886a1e78e1fa495"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-04T12:48:12+00:00",
      "cve": "CVE-2026-99225",
      "id": "CVE-2026-99225",
      "initial_release_date": "2026-11-02T16:06:34.759000+00:00",
      "product_status:known_affected": "203",
      "product_status:known_not_affected": "77",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via NULL pointer dereference during keyring searches",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99225.json",
      "version": "3"
    }
  }
}



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