{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-50301","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-10-21T19:36:19.987Z","datePublished":"2024-11-19T01:30:49.982Z","dateUpdated":"2025-11-03T22:28:18.152Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T09:51:13.203Z"},"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.]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/keys/keyring.c"],"versions":[{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"c3ce634ad953ce48c75c39bdfd8b711dd95f346f","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"4efb69a0e294ef201bcdf7ce3d6202cd0a545a5d","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"1e4332581cd4eed75aea77af6f66cdcdda8b49b9","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"199c20fb7499c79557a075dc24e9a7dae7d9f1ce","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"bbad2d5b6c99db468d8f88b6ba6a56ed409b4881","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"3e79ad156bedf2da0ab909a118d2cec6c9c22b79","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"e0a317ad68e4ea48a0158187238c5407e4fdec8b","status":"affected","versionType":"git"},{"version":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69","lessThan":"4a74da044ec9ec8679e6beccc4306b936b62873f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/keys/keyring.c"],"versions":[{"version":"3.13","status":"affected"},{"version":"0","lessThan":"3.13","status":"unaffected","versionType":"semver"},{"version":"4.19.324","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.286","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.230","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.172","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.117","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.61","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.11.8","lessThanOrEqual":"6.11.*","status":"unaffected","versionType":"semver"},{"version":"6.12","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"4.19.324"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.4.286"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.230"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.172"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.11.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12"}]}]}],"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"}],"title":"security/keys: fix slab-out-of-bounds in key_task_permission","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"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"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-01T20:17:19.840Z"}},{"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"}}]}}