222 lines
11 KiB
JSON
222 lines
11 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-2022-49770",
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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": "2025-04-16T07:17:33.805Z",
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"datePublished": "2025-05-01T14:09:08.173Z",
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"dateUpdated": "2026-08-15T12:22:57.784Z"
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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": "2026-08-15T12:22:57.784Z"
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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: avoid putting the realm twice when decoding snaps fails\n\nWhen decoding the snaps fails it maybe leaving the 'first_realm'\nand 'realm' pointing to the same snaprealm memory. And then it'll\nput it twice and could cause random use-after-free, BUG_ON, etc\nissues."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - Corrupted snap traces reach ceph_update_snap_trace() via MDS-originated CephFS messages (CEPH_MSG_CLIENT_SNAP, cap IMPORT snaptrace, reply snapblobs) over the TCP messenger; a malicious, compromised, or on-path MDS triggers the bug with network traffic alone.\nAC:L - A malicious MDS can craft a multi-realm snap trace whose first realm decodes successfully (setting first_realm) and whose subsequent record fails ceph_decode_need, reliably hitting the double-put path with no race or layout dependency.\nPR:N - Exploitation needs no privileges on the victim client—the attacking MDS peer requires no local account or capability, matching other CephFS client MDS-message bugs scored PR:N.\nUI:N - With CephFS already mounted (normal deployment state), the MDS can unilaterally push snap/cap messages during snapshot ops or reconnect without any further victim action at exploit time.\nS:U - Impact stays inside the client kernel and CephFS mount authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Double-putting the snap realm frees struct ceph_snap_realm while inodes and hierarchy links retain dangling pointers, yielding a classic heap UAF read primitive over attacker-reclaimable slab memory.\nI:H - The same UAF write path (nref/list updates on a recycled snap_realm, plus later use via get_quota_realm/ceph_get_snap_realm) enables heap corruption and control-flow hijack primitives.\nA:H - Production reports show LIST_POISON GPFs and client hangs requiring reboot after the double-put, and any UAF of this form can oops or panic the kernel."
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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/snap.c"
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],
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{
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{
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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/snap.c"
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],
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"versions": [
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{
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"version": "4.0",
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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": "4.0",
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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": "4.19.268",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.226",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.157",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.81",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.0.10",
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"lessThanOrEqual": "6.0.*",
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"status": "unaffected",
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},
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{
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"version": "6.1",
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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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"references": [
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"url": "https://git.kernel.org/stable/c/274e4c79a3a2a24fba7cfe0e41113f1138785c37"
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"url": "https://git.kernel.org/stable/c/fd879c83e87735ab8f00ef7755752cf0cbae24b2"
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{
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"url": "https://git.kernel.org/stable/c/51884d153f7ec85e18d607b2467820a90e0f4359"
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}
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],
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"title": "ceph: avoid putting the realm twice when decoding snaps fails",
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