CVE-2026-68433 (GCVE-0-2026-68433)
Vulnerability from cvelistv5
Published
2026-08-12 00:07
Modified
2026-10-19 21:09
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: bound get_version reply decode to front len handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received. A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read. Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.
References
Impacted products
Vendor Product Version
Linux Linux Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
Version: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376
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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-\u003eu.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-\u003eresult || !greq-\u003eu.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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"1307028f082756bf453e1889aee9983d30643a4b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"72a35070fcefa229b1b031aa7482ad3788e18f07\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"340e0386aa39da181015bee38f309018c335ce16\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"d60de8253c85a02d0e6194b0735e7a562981a04c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"4e7ebfaa0d14cf50e44041bfde38070d6dbc019f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"0d934c934ec746d53fc7e4f53239792647bbae63\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"513a8243d67f8e8d27f2883bd2f18bc87c7ca376\", \"lessThan\": \"d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ceph/mon_client.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ceph/mon_client.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003efront_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-\u003efront.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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:35:33.508Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68433\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:10.325Z\", \"dateReserved\": \"2026-07-30T09:28:09.393Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-12T00:07:20.455Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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