CVE-2024-50301 (GCVE-0-2024-50301)

Vulnerability from cvelistv5 – Published: 2024-11-19 01:30 – Updated: 2026-05-12 12:00
VLAI
Title
security/keys: fix slab-out-of-bounds in key_task_permission
Summary
In the Linux kernel, the following vulnerability has been resolved: security/keys: fix slab-out-of-bounds in key_task_permission KASAN reports an out of bounds read: BUG: KASAN: slab-out-of-bounds in __kuid_val include/linux/uidgid.h:36 BUG: KASAN: slab-out-of-bounds in uid_eq include/linux/uidgid.h:63 [inline] BUG: KASAN: slab-out-of-bounds in key_task_permission+0x394/0x410 security/keys/permission.c:54 Read of size 4 at addr ffff88813c3ab618 by task stress-ng/4362 CPU: 2 PID: 4362 Comm: stress-ng Not tainted 5.10.0-14930-gafbffd6c3ede #15 Call Trace: __dump_stack lib/dump_stack.c:82 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:123 print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 __kuid_val include/linux/uidgid.h:36 [inline] uid_eq include/linux/uidgid.h:63 [inline] key_task_permission+0x394/0x410 security/keys/permission.c:54 search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793 This issue was also reported by syzbot. It can be reproduced by following these steps(more details [1]): 1. Obtain more than 32 inputs that have similar hashes, which ends with the pattern '0xxxxxxxe6'. 2. Reboot and add the keys obtained in step 1. The reproducer demonstrates how this issue happened: 1. In the search_nested_keyrings function, when it iterates through the slots in a node(below tag ascend_to_node), if the slot pointer is meta and node->back_pointer != NULL(it means a root), it will proceed to descend_to_node. However, there is an exception. If node is the root, and one of the slots points to a shortcut, it will be treated as a keyring. 2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function. However, KEYRING_PTR_SUBTYPE is 0x2UL, the same as ASSOC_ARRAY_PTR_SUBTYPE_MASK. 3. When 32 keys with the similar hashes are added to the tree, the ROOT has keys with hashes that are not similar (e.g. slot 0) and it splits NODE A without using a shortcut. When NODE A is filled with keys that all hashes are xxe6, the keys are similar, NODE A will split with a shortcut. Finally, it forms the tree as shown below, where slot 6 points to a shortcut. NODE A +------>+---+ ROOT | | 0 | xxe6 +---+ | +---+ xxxx | 0 | shortcut : : xxe6 +---+ | +---+ xxe6 : : | | | xxe6 +---+ | +---+ | 6 |---+ : : xxe6 +---+ +---+ xxe6 : : | f | xxe6 +---+ +---+ xxe6 | f | +---+ 4. As mentioned above, If a slot(slot 6) of the root points to a shortcut, it may be mistakenly transferred to a key*, leading to a read out-of-bounds read. To fix this issue, one should jump to descend_to_node if the ptr is a shortcut, regardless of whether the node is root or not. [1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/ [jarkko: tweaked the commit message a bit to have an appropriate closes tag.]
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < c3ce634ad953ce48c75c39bdfd8b711dd95f346f (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 1e4332581cd4eed75aea77af6f66cdcdda8b49b9 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 199c20fb7499c79557a075dc24e9a7dae7d9f1ce (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < bbad2d5b6c99db468d8f88b6ba6a56ed409b4881 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 3e79ad156bedf2da0ab909a118d2cec6c9c22b79 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < e0a317ad68e4ea48a0158187238c5407e4fdec8b (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 4a74da044ec9ec8679e6beccc4306b936b62873f (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 4.19.324 , ≤ 4.19.* (semver)
Unaffected: 5.4.286 , ≤ 5.4.* (semver)
Unaffected: 5.10.230 , ≤ 5.10.* (semver)
Unaffected: 5.15.172 , ≤ 5.15.* (semver)
Unaffected: 6.1.117 , ≤ 6.1.* (semver)
Unaffected: 6.6.61 , ≤ 6.6.* (semver)
Unaffected: 6.11.8 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.2 (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Affected: 0 , < V3.2 (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.2 (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsecurity/keys: fix slab-out-of-bounds in key_task_permission\n\nKASAN reports an out of bounds read:\nBUG: KASAN: slab-out-of-bounds in __kuid_val include/linux/uidgid.h:36\nBUG: KASAN: slab-out-of-bounds in uid_eq include/linux/uidgid.h:63 [inline]\nBUG: KASAN: slab-out-of-bounds in key_task_permission+0x394/0x410\nsecurity/keys/permission.c:54\nRead of size 4 at addr ffff88813c3ab618 by task stress-ng/4362\n\nCPU: 2 PID: 4362 Comm: stress-ng Not tainted 5.10.0-14930-gafbffd6c3ede #15\nCall Trace:\n __dump_stack lib/dump_stack.c:82 [inline]\n dump_stack+0x107/0x167 lib/dump_stack.c:123\n print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\n __kuid_val include/linux/uidgid.h:36 [inline]\n uid_eq include/linux/uidgid.h:63 [inline]\n key_task_permission+0x394/0x410 security/keys/permission.c:54\n search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793\n\nThis issue was also reported by syzbot.\n\nIt can be reproduced by following these steps(more details [1]):\n1. Obtain more than 32 inputs that have similar hashes, which ends with the\n   pattern \u00270xxxxxxxe6\u0027.\n2. Reboot and add the keys obtained in step 1.\n\nThe reproducer demonstrates how this issue happened:\n1. In the search_nested_keyrings function, when it iterates through the\n   slots in a node(below tag ascend_to_node), if the slot pointer is meta\n   and node-\u003eback_pointer != NULL(it means a root), it will proceed to\n   descend_to_node. However, there is an exception. If node is the root,\n   and one of the slots points to a shortcut, it will be treated as a\n   keyring.\n2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function.\n   However, KEYRING_PTR_SUBTYPE is 0x2UL, the same as\n   ASSOC_ARRAY_PTR_SUBTYPE_MASK.\n3. When 32 keys with the similar hashes are added to the tree, the ROOT\n   has keys with hashes that are not similar (e.g. slot 0) and it splits\n   NODE A without using a shortcut. When NODE A is filled with keys that\n   all hashes are xxe6, the keys are similar, NODE A will split with a\n   shortcut. Finally, it forms the tree as shown below, where slot 6 points\n   to a shortcut.\n\n                      NODE A\n              +------\u003e+---+\n      ROOT    |       | 0 | xxe6\n      +---+   |       +---+\n xxxx | 0 | shortcut  :   : xxe6\n      +---+   |       +---+\n xxe6 :   :   |       |   | xxe6\n      +---+   |       +---+\n      | 6 |---+       :   : xxe6\n      +---+           +---+\n xxe6 :   :           | f | xxe6\n      +---+           +---+\n xxe6 | f |\n      +---+\n\n4. As mentioned above, If a slot(slot 6) of the root points to a shortcut,\n   it may be mistakenly transferred to a key*, leading to a read\n   out-of-bounds read.\n\nTo fix this issue, one should jump to descend_to_node if the ptr is a\nshortcut, regardless of whether the node is root or not.\n\n[1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/\n\n[jarkko: tweaked the commit message a bit to have an appropriate closes\n tag.]"
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          "url": "https://git.kernel.org/stable/c/4a74da044ec9ec8679e6beccc4306b936b62873f"
        }
      ],
      "title": "security/keys: fix slab-out-of-bounds in key_task_permission",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50301",
    "datePublished": "2024-11-19T01:30:49.982Z",
    "dateReserved": "2024-10-21T19:36:19.987Z",
    "dateUpdated": "2026-05-12T12:00:59.478Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-50301",
      "date": "2026-06-06",
      "epss": "0.0004",
      "percentile": "0.12295"
    },
    "fkie_nvd": {
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsecurity/keys: fix slab-out-of-bounds in key_task_permission\\n\\nKASAN reports an out of bounds read:\\nBUG: KASAN: slab-out-of-bounds in __kuid_val include/linux/uidgid.h:36\\nBUG: KASAN: slab-out-of-bounds in uid_eq include/linux/uidgid.h:63 [inline]\\nBUG: KASAN: slab-out-of-bounds in key_task_permission+0x394/0x410\\nsecurity/keys/permission.c:54\\nRead of size 4 at addr ffff88813c3ab618 by task stress-ng/4362\\n\\nCPU: 2 PID: 4362 Comm: stress-ng Not tainted 5.10.0-14930-gafbffd6c3ede #15\\nCall Trace:\\n __dump_stack lib/dump_stack.c:82 [inline]\\n dump_stack+0x107/0x167 lib/dump_stack.c:123\\n print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400\\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\\n __kuid_val include/linux/uidgid.h:36 [inline]\\n uid_eq include/linux/uidgid.h:63 [inline]\\n key_task_permission+0x394/0x410 security/keys/permission.c:54\\n search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793\\n\\nThis issue was also reported by syzbot.\\n\\nIt can be reproduced by following these steps(more details [1]):\\n1. Obtain more than 32 inputs that have similar hashes, which ends with the\\n   pattern \u00270xxxxxxxe6\u0027.\\n2. Reboot and add the keys obtained in step 1.\\n\\nThe reproducer demonstrates how this issue happened:\\n1. In the search_nested_keyrings function, when it iterates through the\\n   slots in a node(below tag ascend_to_node), if the slot pointer is meta\\n   and node-\u003eback_pointer != NULL(it means a root), it will proceed to\\n   descend_to_node. However, there is an exception. If node is the root,\\n   and one of the slots points to a shortcut, it will be treated as a\\n   keyring.\\n2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function.\\n   However, KEYRING_PTR_SUBTYPE is 0x2UL, the same as\\n   ASSOC_ARRAY_PTR_SUBTYPE_MASK.\\n3. When 32 keys with the similar hashes are added to the tree, the ROOT\\n   has keys with hashes that are not similar (e.g. slot 0) and it splits\\n   NODE A without using a shortcut. When NODE A is filled with keys that\\n   all hashes are xxe6, the keys are similar, NODE A will split with a\\n   shortcut. Finally, it forms the tree as shown below, where slot 6 points\\n   to a shortcut.\\n\\n                      NODE A\\n              +------\u003e+---+\\n      ROOT    |       | 0 | xxe6\\n      +---+   |       +---+\\n xxxx | 0 | shortcut  :   : xxe6\\n      +---+   |       +---+\\n xxe6 :   :   |       |   | xxe6\\n      +---+   |       +---+\\n      | 6 |---+       :   : xxe6\\n      +---+           +---+\\n xxe6 :   :           | f | xxe6\\n      +---+           +---+\\n xxe6 | f |\\n      +---+\\n\\n4. As mentioned above, If a slot(slot 6) of the root points to a shortcut,\\n   it may be mistakenly transferred to a key*, leading to a read\\n   out-of-bounds read.\\n\\nTo fix this issue, one should jump to descend_to_node if the ptr is a\\nshortcut, regardless of whether the node is root or not.\\n\\n[1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/\\n\\n[jarkko: tweaked the commit message a bit to have an appropriate closes\\n tag.]\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: security/keys: correcci\\u00f3n de slab-out-of-bounds en key_task_permission KASAN informa una lectura fuera de los l\\u00edmites: ERROR: KASAN: slab-out-of-bounds en __kuid_val include/linux/uidgid.h:36 ERROR: KASAN: slab-out-of-bounds en uid_eq include/linux/uidgid.h:63 [en l\\u00ednea] ERROR: KASAN: slab-out-of-bounds en key_task_permission+0x394/0x410 security/keys/permission.c:54 Lectura de tama\\u00f1o 4 en la direcci\\u00f3n ffff88813c3ab618 por la tarea stress-ng/4362 CPU: 2 PID: 4362 Comm: stress-ng No contaminado 5.10.0-14930-gafbffd6c3ede #15 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:82 [en l\\u00ednea] dump_stack+0x107/0x167 lib/dump_stack.c:123 print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 __kuid_val include/linux/uidgid.h:36 [en l\\u00ednea] uid_eq include/linux/uidgid.h:63 [en l\\u00ednea] key_task_permission+0x394/0x410 security/keys/permission.c:54 search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793 Este problema tambi\\u00e9n fue informado por syzbot. Puede reproducirse siguiendo estos pasos (m\\u00e1s detalles [1]): 1. Obtenga m\\u00e1s de 32 entradas que tengan hashes similares, que terminen con el patr\\u00f3n \u00270xxxxxxxe6\u0027. 2. Reinicie y agregue las claves obtenidas en el paso 1. El reproductor demuestra c\\u00f3mo sucedi\\u00f3 este problema: 1. En la funci\\u00f3n search_nested_keyrings, cuando itera a trav\\u00e9s de las ranuras en un nodo (debajo de la etiqueta ascend_to_node), si el puntero de la ranura es meta y node-\u0026gt;back_pointer != NULL (significa una ra\\u00edz), proceder\\u00e1 a descend_to_node. Sin embargo, hay una excepci\\u00f3n. Si el nodo es la ra\\u00edz y una de las ranuras apunta a un acceso directo, se tratar\\u00e1 como un llavero. 2. Si el ptr es un llavero lo decide la funci\\u00f3n keyring_ptr_is_keyring. Sin embargo, KEYRING_PTR_SUBTYPE es 0x2UL, lo mismo que ASSOC_ARRAY_PTR_SUBTYPE_MASK. 3. Cuando se agregan 32 claves con hashes similares al \\u00e1rbol, la RA\\u00cdZ tiene claves con hashes que no son similares (por ejemplo, la ranura 0) y divide el NODO A sin usar un acceso directo. Cuando el NODO A se llena con claves en las que todos los hashes son xxe6, las claves son similares, el NODO A se dividir\\u00e1 con un acceso directo. Finalmente, forma el \\u00e1rbol como se muestra a continuaci\\u00f3n, donde la ranura 6 apunta a un acceso directo. NODO A +------\u0026gt;+---+ RA\\u00cdZ | | 0 | xxe6 +---+ | +---+ xxxx | 0 | acceso directo : : xxe6 +---+ | +---+ xxe6 : : | | | xxe6 +---+ | +---+ | 6 |---+ : : xxe6 +---+ +---+ xxe6 : : | f | xxe6 +---+ +---+ xxe6 | f | +---+ 4. Como se mencion\\u00f3 anteriormente, si una ranura (ranura 6) de la ra\\u00edz apunta a un acceso directo, puede transferirse por error a una clave*, lo que lleva a una lectura fuera de los l\\u00edmites. Para solucionar este problema, uno debe saltar a descend_to_node si el ptr es un acceso directo, independientemente de si el nodo es ra\\u00edz o no. [1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/ [jarkko: modifiqu\\u00e9 un poco el mensaje de confirmaci\\u00f3n para tener una etiqueta de cierre apropiada].\"}]",
      "id": "CVE-2024-50301",
      "lastModified": "2024-11-21T20:53:03.823",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.2}]}",
      "published": "2024-11-19T02:16:32.230",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/199c20fb7499c79557a075dc24e9a7dae7d9f1ce\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/1e4332581cd4eed75aea77af6f66cdcdda8b49b9\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/3e79ad156bedf2da0ab909a118d2cec6c9c22b79\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/4a74da044ec9ec8679e6beccc4306b936b62873f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/bbad2d5b6c99db468d8f88b6ba6a56ed409b4881\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c3ce634ad953ce48c75c39bdfd8b711dd95f346f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/e0a317ad68e4ea48a0158187238c5407e4fdec8b\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-125\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50301\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-19T02:16:32.230\",\"lastModified\":\"2026-05-12T13:16:20.753\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsecurity/keys: fix slab-out-of-bounds in key_task_permission\\n\\nKASAN reports an out of bounds read:\\nBUG: KASAN: slab-out-of-bounds in __kuid_val include/linux/uidgid.h:36\\nBUG: KASAN: slab-out-of-bounds in uid_eq include/linux/uidgid.h:63 [inline]\\nBUG: KASAN: slab-out-of-bounds in key_task_permission+0x394/0x410\\nsecurity/keys/permission.c:54\\nRead of size 4 at addr ffff88813c3ab618 by task stress-ng/4362\\n\\nCPU: 2 PID: 4362 Comm: stress-ng Not tainted 5.10.0-14930-gafbffd6c3ede #15\\nCall Trace:\\n __dump_stack lib/dump_stack.c:82 [inline]\\n dump_stack+0x107/0x167 lib/dump_stack.c:123\\n print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400\\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\\n __kuid_val include/linux/uidgid.h:36 [inline]\\n uid_eq include/linux/uidgid.h:63 [inline]\\n key_task_permission+0x394/0x410 security/keys/permission.c:54\\n search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793\\n\\nThis issue was also reported by syzbot.\\n\\nIt can be reproduced by following these steps(more details [1]):\\n1. Obtain more than 32 inputs that have similar hashes, which ends with the\\n   pattern \u00270xxxxxxxe6\u0027.\\n2. Reboot and add the keys obtained in step 1.\\n\\nThe reproducer demonstrates how this issue happened:\\n1. In the search_nested_keyrings function, when it iterates through the\\n   slots in a node(below tag ascend_to_node), if the slot pointer is meta\\n   and node-\u003eback_pointer != NULL(it means a root), it will proceed to\\n   descend_to_node. However, there is an exception. If node is the root,\\n   and one of the slots points to a shortcut, it will be treated as a\\n   keyring.\\n2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function.\\n   However, KEYRING_PTR_SUBTYPE is 0x2UL, the same as\\n   ASSOC_ARRAY_PTR_SUBTYPE_MASK.\\n3. When 32 keys with the similar hashes are added to the tree, the ROOT\\n   has keys with hashes that are not similar (e.g. slot 0) and it splits\\n   NODE A without using a shortcut. When NODE A is filled with keys that\\n   all hashes are xxe6, the keys are similar, NODE A will split with a\\n   shortcut. Finally, it forms the tree as shown below, where slot 6 points\\n   to a shortcut.\\n\\n                      NODE A\\n              +------\u003e+---+\\n      ROOT    |       | 0 | xxe6\\n      +---+   |       +---+\\n xxxx | 0 | shortcut  :   : xxe6\\n      +---+   |       +---+\\n xxe6 :   :   |       |   | xxe6\\n      +---+   |       +---+\\n      | 6 |---+       :   : xxe6\\n      +---+           +---+\\n xxe6 :   :           | f | xxe6\\n      +---+           +---+\\n xxe6 | f |\\n      +---+\\n\\n4. As mentioned above, If a slot(slot 6) of the root points to a shortcut,\\n   it may be mistakenly transferred to a key*, leading to a read\\n   out-of-bounds read.\\n\\nTo fix this issue, one should jump to descend_to_node if the ptr is a\\nshortcut, regardless of whether the node is root or not.\\n\\n[1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/\\n\\n[jarkko: tweaked the commit message a bit to have an appropriate closes\\n tag.]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: security/keys: correcci\u00f3n de slab-out-of-bounds en key_task_permission KASAN informa una lectura fuera de los l\u00edmites: ERROR: KASAN: slab-out-of-bounds en __kuid_val include/linux/uidgid.h:36 ERROR: KASAN: slab-out-of-bounds en uid_eq include/linux/uidgid.h:63 [en l\u00ednea] ERROR: KASAN: slab-out-of-bounds en key_task_permission+0x394/0x410 security/keys/permission.c:54 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff88813c3ab618 por la tarea stress-ng/4362 CPU: 2 PID: 4362 Comm: stress-ng No contaminado 5.10.0-14930-gafbffd6c3ede #15 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:82 [en l\u00ednea] dump_stack+0x107/0x167 lib/dump_stack.c:123 print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 __kuid_val include/linux/uidgid.h:36 [en l\u00ednea] uid_eq include/linux/uidgid.h:63 [en l\u00ednea] key_task_permission+0x394/0x410 security/keys/permission.c:54 search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793 Este problema tambi\u00e9n fue informado por syzbot. Puede reproducirse siguiendo estos pasos (m\u00e1s detalles [1]): 1. Obtenga m\u00e1s de 32 entradas que tengan hashes similares, que terminen con el patr\u00f3n \u00270xxxxxxxe6\u0027. 2. Reinicie y agregue las claves obtenidas en el paso 1. El reproductor demuestra c\u00f3mo sucedi\u00f3 este problema: 1. En la funci\u00f3n search_nested_keyrings, cuando itera a trav\u00e9s de las ranuras en un nodo (debajo de la etiqueta ascend_to_node), si el puntero de la ranura es meta y node-\u0026gt;back_pointer != NULL (significa una ra\u00edz), proceder\u00e1 a descend_to_node. Sin embargo, hay una excepci\u00f3n. Si el nodo es la ra\u00edz y una de las ranuras apunta a un acceso directo, se tratar\u00e1 como un llavero. 2. Si el ptr es un llavero lo decide la funci\u00f3n keyring_ptr_is_keyring. Sin embargo, KEYRING_PTR_SUBTYPE es 0x2UL, lo mismo que ASSOC_ARRAY_PTR_SUBTYPE_MASK. 3. Cuando se agregan 32 claves con hashes similares al \u00e1rbol, la RA\u00cdZ tiene claves con hashes que no son similares (por ejemplo, la ranura 0) y divide el NODO A sin usar un acceso directo. Cuando el NODO A se llena con claves en las que todos los hashes son xxe6, las claves son similares, el NODO A se dividir\u00e1 con un acceso directo. Finalmente, forma el \u00e1rbol como se muestra a continuaci\u00f3n, donde la ranura 6 apunta a un acceso directo. NODO A +------\u0026gt;+---+ RA\u00cdZ | | 0 | xxe6 +---+ | +---+ xxxx | 0 | acceso directo : : xxe6 +---+ | +---+ xxe6 : : | | | xxe6 +---+ | +---+ | 6 |---+ : : xxe6 +---+ +---+ xxe6 : : | f | xxe6 +---+ +---+ xxe6 | f | +---+ 4. Como se mencion\u00f3 anteriormente, si una ranura (ranura 6) de la ra\u00edz apunta a un acceso directo, puede transferirse por error a una clave*, lo que lleva a una lectura fuera de los l\u00edmites. Para solucionar este problema, uno debe saltar a descend_to_node si el ptr es un acceso directo, independientemente de si el nodo es ra\u00edz o no. [1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/ [jarkko: modifiqu\u00e9 un poco el mensaje de confirmaci\u00f3n para tener una etiqueta de cierre apropiada].\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.13\",\"versionEndExcluding\":\"4.19.324\",\"matchCriteriaId\":\"6F34367D-A869-4C97-A01F-F5209F24FC10\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.286\",\"matchCriteriaId\":\"9952C897-8A61-4D4B-9D6D-7D063E9EA15E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.230\",\"matchCriteriaId\":\"BF5B32D0-72C9-41C3-A0BB-D4946153C134\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.172\",\"matchCriteriaId\":\"88812664-4296-42AC-AE0F-ED71086C1BB1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.117\",\"matchCriteriaId\":\"0DD7F755-2F6B-4707-8973-78496AD5AA8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.61\",\"matchCriteriaId\":\"630ED7EB-C97E-4435-B884-1E309E40D6F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.8\",\"matchCriteriaId\":\"0BD000F7-3DAD-4DD3-8906-98EA1EC67E95\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0F717D8-3014-4F84-8086-0124B2111379\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"24DBE6C7-2AAE-4818-AED2-E131F153D2FA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"24B88717-53F5-42AA-9B72-14C707639E3F\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/199c20fb7499c79557a075dc24e9a7dae7d9f1ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1e4332581cd4eed75aea77af6f66cdcdda8b49b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3e79ad156bedf2da0ab909a118d2cec6c9c22b79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4a74da044ec9ec8679e6beccc4306b936b62873f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bbad2d5b6c99db468d8f88b6ba6a56ed409b4881\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c3ce634ad953ce48c75c39bdfd8b711dd95f346f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e0a317ad68e4ea48a0158187238c5407e4fdec8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-355557.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-398330.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:28:18.152Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.1, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50301\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T20:13:51.070925Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T15:28:10.342Z\"}}], \"cna\": {\"title\": \"security/keys: fix slab-out-of-bounds in key_task_permission\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"c3ce634ad953ce48c75c39bdfd8b711dd95f346f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"1e4332581cd4eed75aea77af6f66cdcdda8b49b9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"199c20fb7499c79557a075dc24e9a7dae7d9f1ce\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"bbad2d5b6c99db468d8f88b6ba6a56ed409b4881\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"3e79ad156bedf2da0ab909a118d2cec6c9c22b79\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"e0a317ad68e4ea48a0158187238c5407e4fdec8b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69\", \"lessThan\": \"4a74da044ec9ec8679e6beccc4306b936b62873f\", \"versionType\": \"git\"}], \"programFiles\": [\"security/keys/keyring.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.324\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.286\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.230\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.172\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.117\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.61\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"security/keys/keyring.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c3ce634ad953ce48c75c39bdfd8b711dd95f346f\"}, {\"url\": \"https://git.kernel.org/stable/c/4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d\"}, {\"url\": \"https://git.kernel.org/stable/c/1e4332581cd4eed75aea77af6f66cdcdda8b49b9\"}, {\"url\": \"https://git.kernel.org/stable/c/199c20fb7499c79557a075dc24e9a7dae7d9f1ce\"}, {\"url\": \"https://git.kernel.org/stable/c/bbad2d5b6c99db468d8f88b6ba6a56ed409b4881\"}, {\"url\": \"https://git.kernel.org/stable/c/3e79ad156bedf2da0ab909a118d2cec6c9c22b79\"}, {\"url\": \"https://git.kernel.org/stable/c/e0a317ad68e4ea48a0158187238c5407e4fdec8b\"}, {\"url\": \"https://git.kernel.org/stable/c/4a74da044ec9ec8679e6beccc4306b936b62873f\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsecurity/keys: fix slab-out-of-bounds in key_task_permission\\n\\nKASAN reports an out of bounds read:\\nBUG: KASAN: slab-out-of-bounds in __kuid_val include/linux/uidgid.h:36\\nBUG: KASAN: slab-out-of-bounds in uid_eq include/linux/uidgid.h:63 [inline]\\nBUG: KASAN: slab-out-of-bounds in key_task_permission+0x394/0x410\\nsecurity/keys/permission.c:54\\nRead of size 4 at addr ffff88813c3ab618 by task stress-ng/4362\\n\\nCPU: 2 PID: 4362 Comm: stress-ng Not tainted 5.10.0-14930-gafbffd6c3ede #15\\nCall Trace:\\n __dump_stack lib/dump_stack.c:82 [inline]\\n dump_stack+0x107/0x167 lib/dump_stack.c:123\\n print_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400\\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\\n __kuid_val include/linux/uidgid.h:36 [inline]\\n uid_eq include/linux/uidgid.h:63 [inline]\\n key_task_permission+0x394/0x410 security/keys/permission.c:54\\n search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793\\n\\nThis issue was also reported by syzbot.\\n\\nIt can be reproduced by following these steps(more details [1]):\\n1. Obtain more than 32 inputs that have similar hashes, which ends with the\\n   pattern \u00270xxxxxxxe6\u0027.\\n2. Reboot and add the keys obtained in step 1.\\n\\nThe reproducer demonstrates how this issue happened:\\n1. In the search_nested_keyrings function, when it iterates through the\\n   slots in a node(below tag ascend_to_node), if the slot pointer is meta\\n   and node-\u003eback_pointer != NULL(it means a root), it will proceed to\\n   descend_to_node. However, there is an exception. If node is the root,\\n   and one of the slots points to a shortcut, it will be treated as a\\n   keyring.\\n2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function.\\n   However, KEYRING_PTR_SUBTYPE is 0x2UL, the same as\\n   ASSOC_ARRAY_PTR_SUBTYPE_MASK.\\n3. When 32 keys with the similar hashes are added to the tree, the ROOT\\n   has keys with hashes that are not similar (e.g. slot 0) and it splits\\n   NODE A without using a shortcut. When NODE A is filled with keys that\\n   all hashes are xxe6, the keys are similar, NODE A will split with a\\n   shortcut. Finally, it forms the tree as shown below, where slot 6 points\\n   to a shortcut.\\n\\n                      NODE A\\n              +------\u003e+---+\\n      ROOT    |       | 0 | xxe6\\n      +---+   |       +---+\\n xxxx | 0 | shortcut  :   : xxe6\\n      +---+   |       +---+\\n xxe6 :   :   |       |   | xxe6\\n      +---+   |       +---+\\n      | 6 |---+       :   : xxe6\\n      +---+           +---+\\n xxe6 :   :           | f | xxe6\\n      +---+           +---+\\n xxe6 | f |\\n      +---+\\n\\n4. As mentioned above, If a slot(slot 6) of the root points to a shortcut,\\n   it may be mistakenly transferred to a key*, leading to a read\\n   out-of-bounds read.\\n\\nTo fix this issue, one should jump to descend_to_node if the ptr is a\\nshortcut, regardless of whether the node is root or not.\\n\\n[1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/\\n\\n[jarkko: tweaked the commit message a bit to have an appropriate closes\\n tag.]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.324\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.286\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.230\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.172\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.117\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.61\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.8\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"3.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:49:30.283Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50301\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:49:30.283Z\", \"dateReserved\": \"2024-10-21T19:36:19.987Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-19T01:30:49.982Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.
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  • 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.