{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu18.04els/vex/2024/cve-2024-50301-els_os-ubuntu18_04els.json" } ], "title": "Security update on CVE-2024-50301", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2024-50301-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2024-11-19T02:16:00Z", "revision_history": [ { "date": "2024-11-19T02:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-05-19T15:21:54Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 18.04", "product": { "name": "Ubuntu 18.04", "product_id": "Ubuntu-18", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "product": { "name": "linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "product_id": "linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency@4.15.0-245.256?arch=amd64" } } 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"linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "product_id": "linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-modules-4.15.0-245-tuxcare.els33-lowlatency@4.15.0-245.256?arch=amd64" } } }, { "category": "product_version", "name": "linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "product": { "name": "linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "product_id": "linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-headers-4.15.0-245-tuxcare.els33-generic@4.15.0-245.256?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64" }, "product_reference": "linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-image-generic-0:4.15.0.245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-image-generic-0:4.15.0.245.256.amd64" }, "product_reference": "linux-image-generic-0:4.15.0.245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64" }, "product_reference": "linux-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-modules-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-modules-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64" }, "product_reference": "linux-modules-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-buildinfo-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-buildinfo-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64" }, "product_reference": "linux-buildinfo-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-cloud-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-cloud-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64" }, "product_reference": "linux-cloud-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-generic-0:4.15.0.245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-generic-0:4.15.0.245.256.amd64" }, "product_reference": "linux-generic-0:4.15.0.245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-tools-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-tools-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64" }, "product_reference": "linux-tools-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64" }, "product_reference": "linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64" }, "product_reference": "linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "relates_to_product_reference": "Ubuntu-18" } ] }, "vulnerabilities": [ { "cve": "CVE-2024-50301", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "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.]", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "Ubuntu-18:linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-image-generic-0:4.15.0.245.256.amd64", "Ubuntu-18:linux-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-modules-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-buildinfo-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-cloud-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-generic-0:4.15.0.245.256.amd64", "Ubuntu-18:linux-tools-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2024-50301" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/199c20fb7499c79557a075dc24e9a7dae7d9f1ce", "url": "https://git.kernel.org/stable/c/199c20fb7499c79557a075dc24e9a7dae7d9f1ce" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/1e4332581cd4eed75aea77af6f66cdcdda8b49b9", "url": "https://git.kernel.org/stable/c/1e4332581cd4eed75aea77af6f66cdcdda8b49b9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3e79ad156bedf2da0ab909a118d2cec6c9c22b79", "url": "https://git.kernel.org/stable/c/3e79ad156bedf2da0ab909a118d2cec6c9c22b79" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4a74da044ec9ec8679e6beccc4306b936b62873f", "url": "https://git.kernel.org/stable/c/4a74da044ec9ec8679e6beccc4306b936b62873f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d", "url": "https://git.kernel.org/stable/c/4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/bbad2d5b6c99db468d8f88b6ba6a56ed409b4881", "url": "https://git.kernel.org/stable/c/bbad2d5b6c99db468d8f88b6ba6a56ed409b4881" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c3ce634ad953ce48c75c39bdfd8b711dd95f346f", "url": "https://git.kernel.org/stable/c/c3ce634ad953ce48c75c39bdfd8b711dd95f346f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e0a317ad68e4ea48a0158187238c5407e4fdec8b", "url": "https://git.kernel.org/stable/c/e0a317ad68e4ea48a0158187238c5407e4fdec8b" } ], "release_date": "2024-11-19T02:16:00", "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1" }, "products": [ "Ubuntu-18:linux-cloud-tools-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-image-generic-0:4.15.0.245.256.amd64", "Ubuntu-18:linux-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-modules-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-buildinfo-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-cloud-tools-4.15.0-245-tuxcare.els33-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-generic-0:4.15.0.245.256.amd64", "Ubuntu-18:linux-tools-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-modules-4.15.0-245-tuxcare.els33-lowlatency-0:4.15.0-245.256.amd64", "Ubuntu-18:linux-headers-4.15.0-245-tuxcare.els33-generic-0:4.15.0-245.256.amd64" ] } ], "threats": [ { "category": "impact", "details": "High" } ] } ] }