269 lines
15 KiB
JSON
269 lines
15 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-2025-39880",
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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": "2025-04-16T07:20:57.144Z",
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"datePublished": "2025-09-23T06:00:49.897Z",
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"dateUpdated": "2026-10-15T22:02:32.742Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:05:50.970Z"
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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\nlibceph: fix invalid accesses to ceph_connection_v1_info\n\nThere is a place where generic code in messenger.c is reading and\nanother place where it is writing to con->v1 union member without\nchecking that the union member is active (i.e. msgr1 is in use).\n\nOn 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter,\nso such a read is almost guaranteed to return a bogus value instead of\n0 when msgr2 is in use. This ends up being fairly benign because the\nside effect is just the invalidation of the authorizer and successive\nfetching of new tickets.\n\ncon->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that\nit's being written to can cause more serious consequences, but luckily\nit's not something that happens often."
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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 - The faulting/STANDBY transitions that reach both bad accesses are driven by the remote ceph peer's socket behaviour (connection reset, close, or a failed msgr2 handshake) over TCP, so a malicious or compromised MON/OSD/MDS — or an on-path attacker able to disrupt the session — triggers the code remotely. This matches how other libceph peer-data bugs (CVE-2026-22984, CVE-2026-22990) are scored.\nAC:L - No race or unusual precondition is needed: on any msgr2 connection the union misread is essentially deterministic (`v1.auth_retry` aliases a non-NULL pointer's low word), and the `connect_seq++` write happens on every fault-to-STANDBY followed by a queued message or keepalive, both of which the attacker can induce repeatedly by resetting the connection. msgr2 is the standard deployment mode for modern Ceph clusters, not a rare configuration.\nPR:N - The attacker needs no account or privilege on the victim host; it acts as the remote ceph peer or as a network attacker on the connection. The fault path is reachable during the msgr2 handshake before authentication completes, so it is a pre-authentication trigger.\nUI:N - Everything happens inside the libceph connection state machine and its workqueue handler on an already-established CephFS mount or mapped RBD device; no victim action is required at exploit time.\nS:U - The corruption is confined to kernel memory within the same security authority as the vulnerable code; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The confused `v1.auth_retry` read exposes the low 32 bits of a kernel heap pointer (into the connection object) to a branch decision and to the `dout()` log, and the corrupted `conn_bufs[]` pointer can direct handshake buffers — some of which, such as `authorizer_copy`, are copied out and sent to the peer — at unintended kernel memory, yielding attacker-visible disclosure.\nI:H - This is a union type confusion that performs out-of-bounds writes relative to the active member: zeroing half of `v2.out_iter`'s iovec pointer and incrementing half of a `v2.conn_bufs[]` pointer, corrupting kernel pointer state. The maintainer explicitly notes the `connect_seq` write \"can cause more serious consequences,\" and the affected slot varies across the six affected stable branches because of differing struct layouts.\nA:H - A mangled `conn_bufs[]` entry is consumed by `kvfree()` in `free_conn_bufs()` and dereferenced as a handshake buffer, so the corruption can produce an invalid free or wild access resulting in an oops/panic, taking down a storage client node; the attacker can retrigger the condition indefinitely by repeatedly faulting the connection."
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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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"net/ceph/messenger.c"
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],
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"versions": [
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{
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"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
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"lessThan": "ea12ab684f8ae8a6da11a22c78d94a79e2163096",
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"status": "affected",
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"versionType": "git"
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"lessThan": "591ea9c30737663a471b2bb07b27ddde86b020d5",
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"status": "affected",
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"status": "affected",
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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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"net/ceph/messenger.c"
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],
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"versions": [
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{
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"version": "5.11",
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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": "5.11",
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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": "5.15.194",
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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": "6.1.153",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.107",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.48",
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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": "6.16.8",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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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"title": "libceph: fix invalid accesses to ceph_connection_v1_info",
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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"type": "ssvc",
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"id": "CVE-2025-39880",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:54:32.238506Z"
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"title": "CISA ADP Vulnrichment",
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