CVE-2026-99224 (GCVE-0-2026-99224)

Vulnerability from cvelistv5 – Published: 2026-11-02 16:06 – Updated: 2026-11-03 19:12
VLAI
Title
keys: Protect the type name while describing a key
Summary
In the Linux kernel, the following vulnerability has been resolved: keys: Protect the type name while describing a key keyctl_describe_key() must keep the key type's name alive until kasprintf() has consumed it. The retained key reference keeps the key and its description alive, but does not pin the module providing its type. The name is passed to kasprintf() without holding key->sem. kvasprintf() uses the saved name pointer in two formatting passes, with a GFP_KERNEL allocation between them. With AF_RXRPC=m, a task that passes View permission before type retirement can overlap a privileged module unload in this order: 1. KEYCTL_DESCRIBE looks up the key, saves key->type->name in the kasprintf() arguments and completes the first formatting pass. 2. While the formatter is delayed before its second pass, af_rxrpc_exit() calls unregister_key_type(), which removes the type from the registry and waits for key_gc_keytype(). 3. The collector takes key->sem for writing, retypes the retained key to key_type_dead and completes retirement. Unregistration and module exit return, allowing free_module() to release the type and name. 4. The formatter resumes its second pass and reads the saved name from released module storage, which can fault in string(). Hold key->sem for reading across kasprintf(). The collector then cannot retype the key or complete retirement until both formatting passes have finished. If retirement wins the lock first, formatting uses the core key_type_dead name instead. Release the semaphore immediately after kasprintf(), including on allocation failure, before copying to userspace. Oops report as below: BUG: unable to handle page fault for address: fffffbfff8054794 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page RIP: 0010:string+0x23f/0x470 Call Trace: vsnprintf+0x330/0x1110
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < 19c4de819e52b7f606468fbfe4fcef4e812e2777 (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < a49e6c9a1a5b3457c946a8efb616ce13b4ca8194 (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < 916667df7695366f23cfaf365b5840b228cc4b2e (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < dddd3a1ab7d12ee163477918ff6eb943361db4fe (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < 3c3cfd9e262afc9558c38f8cec57f09d10988546 (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < 6b613747f7ea309ada5b8d05b55398c338f7a968 (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < dea367df18e3a4faac393e3a4e818ee03af89b19 (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < 0461bc8f91116aae4a020e15f4e1c1fd535ab35e (git)
Affected: aa9d4437893f7e015ce5b6d6c443a9ba92c8a2e7 , < fced7238b7e80cf8aa688d5af976e4aa6e33c329 (git)
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Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (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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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Protect the type name while describing a key\n\nkeyctl_describe_key() must keep the key type\u0027s name alive until\nkasprintf() has consumed it. The retained key reference keeps the key\nand its description alive, but does not pin the module providing its\ntype. The name is passed to kasprintf() without holding key-\u003esem.\n\nkvasprintf() uses the saved name pointer in two formatting passes, with\na GFP_KERNEL allocation between them. With AF_RXRPC=m, a task that\npasses View permission before type retirement can overlap a privileged\nmodule unload in this order:\n\n1. KEYCTL_DESCRIBE looks up the key, saves key-\u003etype-\u003ename in the\n   kasprintf() arguments and completes the first formatting pass.\n2. While the formatter is delayed before its second pass,\n   af_rxrpc_exit() calls unregister_key_type(), which removes the type\n   from the registry and waits for key_gc_keytype().\n3. The collector takes key-\u003esem for writing, retypes the retained key\n   to key_type_dead and completes retirement. Unregistration and module\n   exit return, allowing free_module() to release the type and name.\n4. The formatter resumes its second pass and reads the saved name from\n   released module storage, which can fault in string().\n\nHold key-\u003esem for reading across kasprintf(). The collector then cannot\nretype the key or complete retirement until both formatting passes have\nfinished. If retirement wins the lock first, formatting uses the core\nkey_type_dead name instead. Release the semaphore immediately after\nkasprintf(), including on allocation failure, before copying to\nuserspace.\n\nOops report as below:\n\n    BUG: unable to handle page fault for address: fffffbfff8054794\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    RIP: 0010:string+0x23f/0x470\n    Call Trace:\n     vsnprintf+0x330/0x1110"
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:L - Reached from SYSCALL_DEFINE5(keyctl) case KEYCTL_DESCRIBE \u2192 keyctl_describe_key(), which passes the in-kernel key-\u003etype-\u003ename pointer into kasprintf(). The attacker supplies only a key serial via that local syscall; no network protocol carries the type name.\nAC:H - The UAF fires only if unregister_key_type() \u2192 key_gc_keytype() (e.g. af_rxrpc_exit) retypes the key and free_module() unmaps the name after keyctl_describe_key() captures key-\u003etype-\u003ename and before kvasprintf()\u0027s second vsnprintf. delete_module() requires capable(CAP_SYS_MODULE), which this caller cannot get, including in a user namespace.\nPR:L - keyctl_describe_key() uses lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW) with no capable() check. An unprivileged user can add_key(\"rxrpc\", \u2026) with an empty payload (rxrpc_preparse allows datalen==0) into their session keyring and describe it via the default KEY_POS_VIEW|KEY_USR_VIEW bits.\nUI:N - The attacker calls KEYCTL_DESCRIBE on a key they already own. The overlapping admin rmmod/delete_module of the type\u0027s module is the AC:H condition, not a victim mount or open of attacker content.\nS:U - The dangling key-\u003etype-\u003ename read in kvasprintf()/string() and any resulting oops stay inside the host kernel\u0027s keyctl path; this does not cross a VM, IOMMU, or sandbox boundary.\nC:H - keyctl_describe_key() copy_to_user()s the kasprintf() buffer that embeds the dangling key-\u003etype-\u003ename. kvasprintf() walks that pointer in two vsnprintf/string() passes, so after free_module() of af_rxrpc the describe buffer can contain remapped freed module memory, including a large copy if the first pass also races.\nI:H - After key_gc_keytype() retypes the key and free_module() releases af_rxrpc, the captured name pointer aliases freed module pages. Reclaim of those pages lets the attacker control the %s bytes kasprintf() later formats, turning this use-after-free into a kernel write/control-flow primitive per UAF scoring guidance.\nA:H - The reported oops is a supervisor not-present-page fault in string() from vsnprintf() once free_module() has unmapped the type name, which is a kernel oops."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/19c4de819e52b7f606468fbfe4fcef4e812e2777"
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        {
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      "title": "keys: Protect the type name while describing a key",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99224",
    "datePublished": "2026-11-02T16:06:34.014Z",
    "dateReserved": "2026-09-25T10:25:14.402Z",
    "dateUpdated": "2026-11-03T19:12:57.782Z",
    "state": "PUBLISHED"
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        "cveTags": [],
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Protect the type name while describing a key\n\nkeyctl_describe_key() must keep the key type\u0027s name alive until\nkasprintf() has consumed it. The retained key reference keeps the key\nand its description alive, but does not pin the module providing its\ntype. The name is passed to kasprintf() without holding key-\u003esem.\n\nkvasprintf() uses the saved name pointer in two formatting passes, with\na GFP_KERNEL allocation between them. With AF_RXRPC=m, a task that\npasses View permission before type retirement can overlap a privileged\nmodule unload in this order:\n\n1. KEYCTL_DESCRIBE looks up the key, saves key-\u003etype-\u003ename in the\n   kasprintf() arguments and completes the first formatting pass.\n2. While the formatter is delayed before its second pass,\n   af_rxrpc_exit() calls unregister_key_type(), which removes the type\n   from the registry and waits for key_gc_keytype().\n3. The collector takes key-\u003esem for writing, retypes the retained key\n   to key_type_dead and completes retirement. Unregistration and module\n   exit return, allowing free_module() to release the type and name.\n4. The formatter resumes its second pass and reads the saved name from\n   released module storage, which can fault in string().\n\nHold key-\u003esem for reading across kasprintf(). The collector then cannot\nretype the key or complete retirement until both formatting passes have\nfinished. If retirement wins the lock first, formatting uses the core\nkey_type_dead name instead. Release the semaphore immediately after\nkasprintf(), including on allocation failure, before copying to\nuserspace.\n\nOops report as below:\n\n    BUG: unable to handle page fault for address: fffffbfff8054794\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    RIP: 0010:string+0x23f/0x470\n    Call Trace:\n     vsnprintf+0x330/0x1110"
          }
        ],
        "id": "CVE-2026-99224",
        "lastModified": "2026-11-03T20:18:27.833",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.0,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-11-02T16:17:46.830",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0461bc8f91116aae4a020e15f4e1c1fd535ab35e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/19c4de819e52b7f606468fbfe4fcef4e812e2777"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3c3cfd9e262afc9558c38f8cec57f09d10988546"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6b613747f7ea309ada5b8d05b55398c338f7a968"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/916667df7695366f23cfaf365b5840b228cc4b2e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a49e6c9a1a5b3457c946a8efb616ce13b4ca8194"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dddd3a1ab7d12ee163477918ff6eb943361db4fe"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dea367df18e3a4faac393e3a4e818ee03af89b19"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fced7238b7e80cf8aa688d5af976e4aa6e33c329"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:01:04+00:00",
      "cve": "CVE-2026-99224",
      "id": "CVE-2026-99224",
      "initial_release_date": "2026-11-02T16:06:34.014000+00:00",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via use-after-free in keyctl_describe_key",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99224.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-03T17:34:04Z",
      "cve": "CVE-2026-99224",
      "id": "CVE-2026-99224",
      "initial_release_date": "2026-11-03T17:34:04Z",
      "product_status:known_affected": "341",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99224",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99224.json",
      "version": "2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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