{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-22T01:27:43.663","vulnerabilities":[{"cve":{"id":"CVE-2024-50301","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-11-19T02:16:32.230","lastModified":"2025-11-03T23:17:12.650","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 '0xxxxxxxe6'.\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->back_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              +------>+---+\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: corrección de slab-out-of-bounds en key_task_permission KASAN informa una lectura fuera de los límites: 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 línea] ERROR: KASAN: slab-out-of-bounds en key_task_permission+0x394/0x410 security/keys/permission.c:54 Lectura de tamaño 4 en la dirección 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 línea] 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 línea] uid_eq include/linux/uidgid.h:63 [en línea] key_task_permission+0x394/0x410 security/keys/permission.c:54 search_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793 Este problema también fue informado por syzbot. Puede reproducirse siguiendo estos pasos (más detalles [1]): 1. Obtenga más de 32 entradas que tengan hashes similares, que terminen con el patrón '0xxxxxxxe6'. 2. Reinicie y agregue las claves obtenidas en el paso 1. El reproductor demuestra cómo sucedió este problema: 1. En la función search_nested_keyrings, cuando itera a través de las ranuras en un nodo (debajo de la etiqueta ascend_to_node), si el puntero de la ranura es meta y node->back_pointer != NULL (significa una raíz), procederá a descend_to_node. Sin embargo, hay una excepción. Si el nodo es la raíz y una de las ranuras apunta a un acceso directo, se tratará como un llavero. 2. Si el ptr es un llavero lo decide la función 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 árbol, la RAÍZ 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 dividirá con un acceso directo. Finalmente, forma el árbol como se muestra a continuación, donde la ranura 6 apunta a un acceso directo. NODO A +------>+---+ RAÍZ | | 0 | xxe6 +---+ | +---+ xxxx | 0 | acceso directo : : xxe6 +---+ | +---+ xxe6 : : | | | xxe6 +---+ | +---+ | 6 |---+ : : xxe6 +---+ +---+ xxe6 : : | f | xxe6 +---+ +---+ xxe6 | f | +---+ 4. Como se mencionó anteriormente, si una ranura (ranura 6) de la raíz apunta a un acceso directo, puede transferirse por error a una clave*, lo que lleva a una lectura fuera de los límites. Para solucionar este problema, uno debe saltar a descend_to_node si el ptr es un acceso directo, independientemente de si el nodo es raíz o no. [1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/ [jarkko: modifiqué un poco el mensaje de confirmación 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"}]}}]}