CVE-2026-68159 (GCVE-0-2026-68159)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-10-19 20:58
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE __decode_pg_temp() decodes an user-controlled length but only rejects values large enough to overflow the allocation; it does not bound it to CEPH_PG_MAX_SIZE. The helper backs both pg_temp and pg_upmap decoding, and apply_upmap()/get_temp_osds() later copy the decoded list into the fixed-size on-stack array struct ceph_osds.osds[CEPH_PG_MAX_SIZE]. A monitor that sends an OSDMap with a pg_temp/pg_upmap entry longer than 32 thus causes a stack out-of-bounds write. An OSD set for a single PG can never exceed CEPH_PG_MAX_SIZE, so reject longer entries at decode time. The bound is well below the old overflow threshold, so it also covers the allocation-size overflow the previous check guarded against. BUG: KASAN: stack-out-of-bounds in ceph_pg_to_up_acting_osds Write of size 4 ... by task exploit kasan_report (mm/kasan/report.c:595) ceph_pg_to_up_acting_osds (net/ceph/osdmap.c:2617 net/ceph/osdmap.c:2833) calc_target (net/ceph/osd_client.c:1638) __submit_request (net/ceph/osd_client.c:2394) ceph_osdc_start_request (net/ceph/osd_client.c:2490) ceph_osdc_call (net/ceph/osd_client.c:5164) rbd_dev_image_probe (drivers/block/rbd.c:6899) do_rbd_add (drivers/block/rbd.c:7138) ... kernel BUG at net/ceph/osdmap.c:2670! [ idryomov: do the same in __decode_pg_upmap_items() ]
References
Impacted products
Vendor Product Version
Linux Linux Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
Version: a303bb0e58345fe9f7ab2f82b90266f2b5036058
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          "value": "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() ]"
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KASAN-confirmed stack out-of-bounds write in ceph_pg_to_up_acting_osds corrupts adjacent stack memory and can be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak.\\nI:H - Unbounded copy loops in apply_upmap() and get_temp_osds() write attacker-controlled u32 OSD IDs past the fixed osds[CEPH_PG_MAX_SIZE] stack array, enabling control-flow hijack and arbitrary kernel writes.\\nA:H - The reported reproducer triggers KASAN stack-out-of-bounds followed by kernel BUG in ceph_pg_to_up_acting_osds, demonstrating a reliable kernel oops or panic from malformed osdmap processing on Ceph clients.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"66eec4af1e080b695229c9a20635648a6d12fedf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"4daf06456677177f2a6044729abac59c1b49e87b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"42bc06c67d94d5f2a6b33294b0c4b07d8a47c515\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"ebdf4b4f3b1474079980a2e5cd79ad65fb54db57\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"590b07ceea138d49c9b64f65d263aa902d3b4730\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"e36663145abd7024f0281dfb22fdef65f185845b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a303bb0e58345fe9f7ab2f82b90266f2b5036058\", \"lessThan\": \"9f00f9cf2be293efe899db67dc5272e3a9c62717\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ceph/osdmap.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.266\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.184\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.153\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.105\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.46\", \"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/osdmap.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/66eec4af1e080b695229c9a20635648a6d12fedf\"}, {\"url\": \"https://git.kernel.org/stable/c/4daf06456677177f2a6044729abac59c1b49e87b\"}, {\"url\": \"https://git.kernel.org/stable/c/d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1\"}, {\"url\": \"https://git.kernel.org/stable/c/42bc06c67d94d5f2a6b33294b0c4b07d8a47c515\"}, {\"url\": \"https://git.kernel.org/stable/c/ebdf4b4f3b1474079980a2e5cd79ad65fb54db57\"}, {\"url\": \"https://git.kernel.org/stable/c/590b07ceea138d49c9b64f65d263aa902d3b4730\"}, {\"url\": \"https://git.kernel.org/stable/c/e36663145abd7024f0281dfb22fdef65f185845b\"}, {\"url\": \"https://git.kernel.org/stable/c/9f00f9cf2be293efe899db67dc5272e3a9c62717\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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() ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.184\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.153\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.105\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.46\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-23T12:46:00.131Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68159\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:55.255Z\", \"dateReserved\": \"2026-07-30T09:28:09.371Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T11:59:25.697Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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