{"id":"CVE-2026-68159","revision":null,"records":[{"revision":"829bcf98cd1b4ab090bb7ea0aed616a4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68159","aliases":[],"title":"libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE\n\n__decode_pg_temp() decodes an user-controlled length but only rejects\nvalues large enough to overflow the allocation; it does not bound it to\nCEPH_PG_MAX_SIZE. The helper backs both pg_temp and pg_upmap decoding, and\napply_upmap()/get_temp_osds() later copy the decoded list into the fixed-size\non-stack array struct ceph_osds.osds[CEPH_PG_MAX_SIZE]. A monitor that sends\nan OSDMap with a pg_temp/pg_upmap entry longer than 32 thus causes a stack\nout-of-bounds write.\n\nAn OSD set for a single PG can never exceed CEPH_PG_MAX_SIZE, so reject longer\nentries at decode time. The bound is well below the old overflow threshold, so\nit also covers the allocation-size overflow the previous check guarded against.\n\n BUG: KASAN: stack-out-of-bounds in ceph_pg_to_up_acting_osds\n Write of size 4 ... by task exploit\n kasan_report (mm/kasan/report.c:595)\n ceph_pg_to_up_acting_osds (net/ceph/osdmap.c:2617 net/ceph/osdmap.c:2833)\n calc_target (net/ceph/osd_client.c:1638)\n __submit_request (net/ceph/osd_client.c:2394)\n ceph_osdc_start_request (net/ceph/osd_client.c:2490)\n ceph_osdc_call (net/ceph/osd_client.c:5164)\n rbd_dev_image_probe (drivers/block/rbd.c:6899)\n do_rbd_add (drivers/block/rbd.c:7138)\n ...\n kernel BUG at net/ceph/osdmap.c:2670!\n\n[ idryomov: do the same in __decode_pg_upmap_items() ]","state":0,"publishedAt":"2026-08-10T11:59:25.697+00:00","modifiedAt":"2026-10-19T20:58:55.255+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ceph/osdmap.c\"\n ],\n \"versions\": [\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"66eec4af1e080b695229c9a20635648a6d12fedf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"4daf06456677177f2a6044729abac59c1b49e87b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"42bc06c67d94d5f2a6b33294b0c4b07d8a47c515\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"ebdf4b4f3b1474079980a2e5cd79ad65fb54db57\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"590b07ceea138d49c9b64f65d263aa902d3b4730\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"e36663145abd7024f0281dfb22fdef65f185845b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\",\n \"lessThan\": \"9f00f9cf2be293efe899db67dc5272e3a9c62717\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ceph/osdmap.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.13\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.13\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.266\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.217\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.184\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.153\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.105\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.46\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.6\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/66eec4af1e080b695229c9a20635648a6d12fedf","https://git.kernel.org/stable/c/4daf06456677177f2a6044729abac59c1b49e87b","https://git.kernel.org/stable/c/d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1","https://git.kernel.org/stable/c/42bc06c67d94d5f2a6b33294b0c4b07d8a47c515","https://git.kernel.org/stable/c/ebdf4b4f3b1474079980a2e5cd79ad65fb54db57","https://git.kernel.org/stable/c/590b07ceea138d49c9b64f65d263aa902d3b4730","https://git.kernel.org/stable/c/e36663145abd7024f0281dfb22fdef65f185845b","https://git.kernel.org/stable/c/9f00f9cf2be293efe899db67dc5272e3a9c62717"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68159","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68159","identifiers":["CVE-2026-68159"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; 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