CVE-2024-50301

{"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": "2026-10-15T00:57:58.362Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:43:14.416Z"}, "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.]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable keyring search is reached only through local syscalls (keyctl KEYCTL_SEARCH, request_key, add_key); there is no network-facing path to this code.\nAC:L - Triggering is deterministic \u2014 the attacker fully controls key descriptions and can compute 32+ descriptions with colliding hashes offline to force a root-slot shortcut, making the OOB read reliably reproducible.\nPR:L - Any unprivileged local user can create keyrings and add keys to their own session/user keyrings and search them; no capability or root is required.\nUI:N - The attacker adds keys and issues a search entirely on their own; no action by another user is needed.\nS:U - The out-of-bounds access and its effects stay within the kernel's own security scope; no crossing into another security authority (VM/IOMMU) occurs.\nC:H - A shortcut struct is type-confused as a key and read out-of-bounds, yielding an adjacent-heap read primitive that can disclose kernel memory contents.\nI:H - This is a type-confusion bug (shortcut treated as a key/keyring), and traversing the mis-typed object can drive a constrained write (last_used_at) into adjacent memory, so integrity impact is treated as high.\nA:H - Interpreting a shortcut as a keyring and following its bogus keys.root/slot pointers leads to wild reads and OOB access that oops/panic the kernel."}]}], "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", 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The vulnerable keyring search is reached only through local syscalls (keyctl KEYCTL_SEARCH, request_key, add_key); there is no network-facing path to this code.\nAC:L - Triggering is deterministic \u2014 the attacker fully controls key descriptions and can compute 32+ descriptions with colliding hashes offline to force a root-slot shortcut, making the OOB read reliably reproducible.\nPR:L - Any unprivileged local user can create keyrings and add keys to their own session/user keyrings and search them; no capability or root is required.\nUI:N - The attacker adds keys and issues a search entirely on their own; no action by another user is needed.\nS:U - The out-of-bounds access and its effects stay within the kernel's own security scope; no crossing into another security authority (VM/IOMMU) occurs.\nC:H - A shortcut struct is type-confused as a key and read out-of-bounds, yielding an adjacent-heap read primitive that can disclose kernel memory contents.\nI:H - This is a type-confusion bug (shortcut treated as a key/keyring), and traversing the mis-typed object can drive a constrained write (last_used_at) into adjacent memory, so integrity impact is treated as high.\nA:H - Interpreting a shortcut as a keyring and following its bogus keys.root/slot pointers leads to wild reads and OOB access that oops/panic the kernel."}]}], "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 '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.]"}], "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": "2026-08-05T11:43:14.416Z"}}}, "cveMetadata": {"cveId": "CVE-2024-50301", "state": "PUBLISHED", "dateUpdated": "2026-10-15T00:57:58.362Z", "dateReserved": "2024-10-21T19:36:19.987Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-11-19T01:30:49.982Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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: 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 '0xxxxxxxe6'. 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->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 +------>+---+ 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": "2026-10-15T01:19:11.853", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-50301", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T20:13:51.070925Z", "version": "2.0.3"}}]}, "published": "2024-11-19T02:16:32.230", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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": "af854a3a-2127-422b-91ae-364da2661108", "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": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:9581", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.58.1.rt7.399.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-06-25T00:00:00Z"}, {"advisory": "RHSA-2025:9580", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.58.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-06-25T00:00:00Z"}], "bugzilla": {"description": "kernel: security/keys: fix slab-out-of-bounds in key_task_permission", "id": "2327188", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2327188"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsecurity/keys: fix slab-out-of-bounds in key_task_permission\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\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]\ndump_stack+0x107/0x167 lib/dump_stack.c:123\nprint_address_description.constprop.0+0x19/0x170 mm/kasan/report.c:400\n__kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\nkasan_report+0x3a/0x50 mm/kasan/report.c:585\n__kuid_val include/linux/uidgid.h:36 [inline]\nuid_eq include/linux/uidgid.h:63 [inline]\nkey_task_permission+0x394/0x410 security/keys/permission.c:54\nsearch_nested_keyrings+0x90e/0xe90 security/keys/keyring.c:793\nThis issue was also reported by syzbot.\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\npattern '0xxxxxxxe6'.\n2. Reboot and add the keys obtained in step 1.\nThe reproducer demonstrates how this issue happened:\n1. In the search_nested_keyrings function, when it iterates through the\nslots in a node(below tag ascend_to_node), if the slot pointer is meta\nand node->back_pointer != NULL(it means a root), it will proceed to\ndescend_to_node. However, there is an exception. If node is the root,\nand one of the slots points to a shortcut, it will be treated as a\nkeyring.\n2. Whether the ptr is keyring decided by keyring_ptr_is_keyring function.\nHowever, KEYRING_PTR_SUBTYPE is 0x2UL, the same as\nASSOC_ARRAY_PTR_SUBTYPE_MASK.\n3. When 32 keys with the similar hashes are added to the tree, the ROOT\nhas keys with hashes that are not similar (e.g. slot 0) and it splits\nNODE A without using a shortcut. When NODE A is filled with keys that\nall hashes are xxe6, the keys are similar, NODE A will split with a\nshortcut. Finally, it forms the tree as shown below, where slot 6 points\nto a shortcut.\nNODE A\n+------>+---+\nROOT | | 0 | xxe6\n+---+ | +---+\nxxxx | 0 | shortcut : : xxe6\n+---+ | +---+\nxxe6 : : | | | xxe6\n+---+ | +---+\n| 6 |---+ : : xxe6\n+---+ +---+\nxxe6 : : | f | xxe6\n+---+ +---+\nxxe6 | f |\n+---+\n4. As mentioned above, If a slot(slot 6) of the root points to a shortcut,\nit may be mistakenly transferred to a key*, leading to a read\nout-of-bounds read.\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[1] https://lore.kernel.org/linux-kernel/1cfa878e-8c7b-4570-8606-21daf5e13ce7@huaweicloud.com/\n[jarkko: tweaked the commit message a bit to have an appropriate closes\ntag.]"], "name": "CVE-2024-50301", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-11-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50301\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50301\nhttps://lore.kernel.org/linux-cve-announce/2024111907-CVE-2024-50301-ec76@gregkh/T"], "threat_severity": "Moderate"}

{}