138 lines
7.2 KiB
JSON
138 lines
7.2 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-56563",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-27T14:03:05.994Z",
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"datePublished": "2024-12-27T14:23:07.854Z",
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"dateUpdated": "2026-08-05T11:45:07.489Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:45:07.489Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix cred leak in ceph_mds_check_access()\n\nget_current_cred() increments the reference counter, but the\nput_cred() call was missing."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The leak is triggered by ordinary local VFS syscalls (`open`, `creat`, `unlink`, `chmod`, `truncate`) issued against a mounted CephFS; no network peer input reaches the vulnerable function directly.\nAC:L - The missing `put_cred()` is unconditional — every single call to `ceph_mds_check_access()` leaks a reference with no race, timing window, or special configuration required, so a trivial loop drives the leak deterministically.\nPR:L - Any unprivileged local user with access to a path on an already-mounted CephFS can trigger it; the call sites in `ceph_open()`/`ceph_atomic_open()`/`ceph_unlink()`/`__ceph_setattr() ` are reached before any capability or auth gate.\nUI:N - No action by another user is needed — the attacker triggers the leak entirely on their own via normal file operations on the existing mount.\nS:U - The leaked credentials and any resulting corruption stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The leaked object is `struct cred`, incremented through an unchecked `atomic_long_add()` with no `refcount_t` saturation; on 32-bit builds the counter wraps at 2^32, freeing a live credential structure and yielding a use-after-free read primitive over uid/gid/capability fields.\nI:H - The same credential refcount imbalance/overflow permits a freed `cred` to be reallocated and overwritten by attacker-controlled heap content — the classic CVE-2016-0728-style path to arbitrary modification of `cap_effective`/`euid` and full local privilege escalation.\nA:H - Each operation permanently pins a `cred` plus its `user_struct`, `user_namespace`, `ucounts`, `group_info` and keyrings, so an unprivileged loop produces an unbounded, unreclaimable kernel memory leak ending in OOM, and the 32-bit refcount wrap causes an outright UAF crash."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ceph/mds_client.c"
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],
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"versions": [
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{
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"version": "596afb0b8933ba6ed7227adcc538db26feb25c74",
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"lessThan": "e3d1c9e2b811f13bdbbb962c2b17a6091c28522c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "596afb0b8933ba6ed7227adcc538db26feb25c74",
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"lessThan": "c5cf420303256dcd6ff175643e9e9558543c2047",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ceph/mds_client.c"
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],
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"versions": [
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{
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"version": "6.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.4",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.12.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.13"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e3d1c9e2b811f13bdbbb962c2b17a6091c28522c"
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},
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{
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"url": "https://git.kernel.org/stable/c/c5cf420303256dcd6ff175643e9e9558543c2047"
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}
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],
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"title": "ceph: fix cred leak in ceph_mds_check_access()",
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"x_generator": {
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} |