{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-47221", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-04-10T18:59:19.529Z", "datePublished": "2024-05-21T14:19:27.553Z", "dateUpdated": "2024-11-04T12:01:45.260Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T12:01:45.260Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: actually fix freelist pointer vs redzoning\n\nIt turns out that SLUB redzoning (\"slub_debug=Z\") checks from\ns->object_size rather than from s->inuse (which is normally bumped to\nmake room for the freelist pointer), so a cache created with an object\nsize less than 24 would have the freelist pointer written beyond\ns->object_size, causing the redzone to be corrupted by the freelist\npointer. This was very visible with \"slub_debug=ZF\":\n\n BUG test (Tainted: G B ): Right Redzone overwritten\n -----------------------------------------------------------------------------\n\n INFO: 0xffff957ead1c05de-0xffff957ead1c05df @offset=1502. First byte 0x1a instead of 0xbb\n INFO: Slab 0xffffef3950b47000 objects=170 used=170 fp=0x0000000000000000 flags=0x8000000000000200\n INFO: Object 0xffff957ead1c05d8 @offset=1496 fp=0xffff957ead1c0620\n\n Redzone (____ptrval____): bb bb bb bb bb bb bb bb ........\n Object (____ptrval____): 00 00 00 00 00 f6 f4 a5 ........\n Redzone (____ptrval____): 40 1d e8 1a aa @....\n Padding (____ptrval____): 00 00 00 00 00 00 00 00 ........\n\nAdjust the offset to stay within s->object_size.\n\n(Note that no caches of in this size range are known to exist in the\nkernel currently.)"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/slub.c"], "versions": [{"version": "89b83f282d8b", "lessThan": "f6ed23575416", "status": "affected", "versionType": "git"}, {"version": "89b83f282d8b", "lessThan": "ce6e8bee7a38", "status": "affected", "versionType": "git"}, {"version": "89b83f282d8b", "lessThan": "e41a49fadbc8", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/slub.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.46", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.13", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/f6ed2357541612a13a5841b3af4dc32ed984a25f"}, {"url": "https://git.kernel.org/stable/c/ce6e8bee7a3883e8008b30f5887dbb426aac6a35"}, {"url": "https://git.kernel.org/stable/c/e41a49fadbc80b60b48d3c095d9e2ee7ef7c9a8e"}], "title": "mm/slub: actually fix freelist pointer vs redzoning", "x_generator": {"engine": "bippy-9e1c9544281a"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-17T17:38:07.843861Z", "id": "CVE-2021-47221", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T17:40:09.755Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.427Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/f6ed2357541612a13a5841b3af4dc32ed984a25f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/ce6e8bee7a3883e8008b30f5887dbb426aac6a35", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e41a49fadbc80b60b48d3c095d9e2ee7ef7c9a8e", "tags": ["x_transferred"]}]}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: actually fix freelist pointer vs redzoning\n\nIt turns out that SLUB redzoning (\"slub_debug=Z\") checks from\ns->object_size rather than from s->inuse (which is normally bumped to\nmake room for the freelist pointer), so a cache created with an object\nsize less than 24 would have the freelist pointer written beyond\ns->object_size, causing the redzone to be corrupted by the freelist\npointer. This was very visible with \"slub_debug=ZF\":\n\n BUG test (Tainted: G B ): Right Redzone overwritten\n -----------------------------------------------------------------------------\n\n INFO: 0xffff957ead1c05de-0xffff957ead1c05df @offset=1502. First byte 0x1a instead of 0xbb\n INFO: Slab 0xffffef3950b47000 objects=170 used=170 fp=0x0000000000000000 flags=0x8000000000000200\n INFO: Object 0xffff957ead1c05d8 @offset=1496 fp=0xffff957ead1c0620\n\n Redzone (____ptrval____): bb bb bb bb bb bb bb bb ........\n Object (____ptrval____): 00 00 00 00 00 f6 f4 a5 ........\n Redzone (____ptrval____): 40 1d e8 1a aa @....\n Padding (____ptrval____): 00 00 00 00 00 00 00 00 ........\n\nAdjust the offset to stay within s->object_size.\n\n(Note that no caches of in this size range are known to exist in the\nkernel currently.)"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mm/slub: en realidad corrige el puntero de lista libre frente a redzoning. Resulta que SLUB redzoning (\"slub_debug=Z\") verifica desde s->object_size en lugar de s->inuse (que normalmente se elimina para dejar espacio para el puntero de lista libre), por lo que un cach\u00e9 creado con un tama\u00f1o de objeto menor a 24 tendr\u00eda el puntero de lista libre escrito m\u00e1s all\u00e1 de s->object_size, causando que el puntero de lista libre corrompa la zona roja. Esto fue muy visible con \"slub_debug=ZF\": prueba de BUG(contaminada: GB): zona roja derecha sobrescrita ---------------------------- ------------------------------------------------- INFORMACI\u00d3N : 0xffff957ead1c05de-0xffff957ead1c05df @offset=1502. Primer byte 0x1a en lugar de 0xbb INFORMACI\u00d3N: slab 0xffffef3950b47000 objetos=170 usados=170 fp=0x0000000000000000 banderas=0x80000000000000200 INFORMACI\u00d3N: Objeto 0xffff957ead1c05d8 @offset=1496 fp=0xffff9 57ead1c0620 Zona roja (____ptrval____): bb bb bb bb bb bb bb bb .... .... Objeto (____ptrval____): 00 00 00 00 00 f6 f4 a5 ........ Redzone (____ptrval____): 40 1d e8 1a aa @.... Relleno (____ptrval____): 00 00 00 00 00 00 00 00 ........ Ajuste el desplazamiento para permanecer dentro de s->object_size. (Tenga en cuenta que actualmente no se sabe que existan cach\u00e9s de este rango de tama\u00f1o en el kernel)."}], "id": "CVE-2021-47221", "lastModified": "2024-05-21T16:54:26.047", "metrics": {}, "published": "2024-05-21T15:15:11.380", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce6e8bee7a3883e8008b30f5887dbb426aac6a35"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e41a49fadbc80b60b48d3c095d9e2ee7ef7c9a8e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6ed2357541612a13a5841b3af4dc32ed984a25f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: mm/slub: actually fix freelist pointer vs redzoning", "id": "2282597", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282597"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/slub: actually fix freelist pointer vs redzoning\nIt turns out that SLUB redzoning (\"slub_debug=Z\") checks from\ns->object_size rather than from s->inuse (which is normally bumped to\nmake room for the freelist pointer), so a cache created with an object\nsize less than 24 would have the freelist pointer written beyond\ns->object_size, causing the redzone to be corrupted by the freelist\npointer. This was very visible with \"slub_debug=ZF\":\nBUG test (Tainted: G B ): Right Redzone overwritten\n-----------------------------------------------------------------------------\nINFO: 0xffff957ead1c05de-0xffff957ead1c05df @offset=1502. First byte 0x1a instead of 0xbb\nINFO: Slab 0xffffef3950b47000 objects=170 used=170 fp=0x0000000000000000 flags=0x8000000000000200\nINFO: Object 0xffff957ead1c05d8 @offset=1496 fp=0xffff957ead1c0620\nRedzone (____ptrval____): bb bb bb bb bb bb bb bb ........\nObject (____ptrval____): 00 00 00 00 00 f6 f4 a5 ........\nRedzone (____ptrval____): 40 1d e8 1a aa @....\nPadding (____ptrval____): 00 00 00 00 00 00 00 00 ........\nAdjust the offset to stay within s->object_size.\n(Note that no caches of in this size range are known to exist in the\nkernel currently.)"], "name": "CVE-2021-47221", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47221\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47221\nhttps://lore.kernel.org/linux-cve-announce/2024052135-CVE-2021-47221-4e17@gregkh/T"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.10.46, kernel 5.12.13, kernel 5.13"}