{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68433", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.393Z", "datePublished": "2026-08-12T00:07:20.455Z", "dateUpdated": "2026-08-19T16:35:33.508Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:35:33.508Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: bound get_version reply decode to front len\n\nhandle_get_version_reply() uses msg->front_alloc_len as the decode\nboundary for MON_GET_VERSION_REPLY. That is the size of the reused\nreply buffer, not the number of bytes actually received.\n\nA truncated reply can therefore pass ceph_decode_need() and decode the\nsecond u64 from stale tail bytes left in the buffer by an earlier\nmessage, causing an uninitialized memory read.\n\nUse msg->front.iov_len as the receive-side decode boundary, matching\nother libceph reply handlers and limiting decoding to the bytes that\nwere actually read from the wire." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "baseScore": 8.6, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The malformed MON_GET_VERSION_REPLY arrives over the ceph messenger TCP connection to a monitor; a malicious/compromised ceph-mon or an on-path attacker on the msgr1/crc-mode session triggers the bug purely with received network data.\nAC:L - The attacker fully controls the reply's hdr.front_len and tid, so truncating the reply to 8 bytes reliably makes the handler decode past the received data every time; no race or memory-layout condition outside attacker control is involved.\nPR:N - The vulnerable decode runs on any reply the client accepts for an outstanding generic request; the attacker acts as the remote server/peer and needs no credentials or account on the victim kernel client.\nUI:N - An already-mounted CephFS/RBD client issues mon_get_version requests automatically (osdmap checks, pool-dne checks, remount/latest-map waits), so no local user action is needed once the client is connected.\nS:U - The uninitialized read and the resulting bogus epoch stay within the kernel's own libceph client state; no security authority other than the affected kernel is impacted.\nC:L - Eight bytes of uninitialized kvmalloc'd heap (or stale bytes of a prior reply) are consumed as req->u.newest; the read stays inside the 32-byte allocation and is not copied to userspace, so it is a small bounded uninitialized-memory disclosure that only leaks indirectly through client behaviour.\nI:L - The attacker causes kernel state (req->u.newest, r_map_dne_bound, linger map_dne_bound) to be populated from uninitialized memory rather than the wire, corrupting osdmap-epoch bookkeeping and leading to wrong pool-does-not-exist decisions, but gives no arbitrary write.\nA:H - A zero stale value trips WARN_ON(greq->result || !greq->u.newest) in map_check_cb()/linger_map_check_cb() (panic with panic_on_warn), while a huge garbage epoch makes ceph_monc_wait_osdmap() block until mount_timeout or indefinitely and makes check_pool_dne() abort in-flight requests with -ENOENT; all repeatable at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/mon_client.c" ], "versions": [ { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "1307028f082756bf453e1889aee9983d30643a4b", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "72a35070fcefa229b1b031aa7482ad3788e18f07", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "340e0386aa39da181015bee38f309018c335ce16", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "d60de8253c85a02d0e6194b0735e7a562981a04c", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "4e7ebfaa0d14cf50e44041bfde38070d6dbc019f", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "0d934c934ec746d53fc7e4f53239792647bbae63", "status": "affected", "versionType": "git" }, { "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376", "lessThan": "d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/mon_client.c" ], "versions": [ { "version": "3.16", "status": "affected" }, { "version": "0", "lessThan": "3.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "3.16", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1307028f082756bf453e1889aee9983d30643a4b" }, { "url": "https://git.kernel.org/stable/c/f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e" }, { "url": "https://git.kernel.org/stable/c/72a35070fcefa229b1b031aa7482ad3788e18f07" }, { "url": "https://git.kernel.org/stable/c/340e0386aa39da181015bee38f309018c335ce16" }, { "url": "https://git.kernel.org/stable/c/d60de8253c85a02d0e6194b0735e7a562981a04c" }, { "url": "https://git.kernel.org/stable/c/4e7ebfaa0d14cf50e44041bfde38070d6dbc019f" }, { "url": "https://git.kernel.org/stable/c/0d934c934ec746d53fc7e4f53239792647bbae63" }, { "url": "https://git.kernel.org/stable/c/d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0" } ], "title": "libceph: bound get_version reply decode to front len", "x_generator": { "engine": "bippy-1.2.0" } } } }