{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68131","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-30T09:28:09.370Z","datePublished":"2026-08-10T11:58:54.155Z","dateUpdated":"2026-08-19T16:29:49.752Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-19T16:29:49.752Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrbd: Reset positive result codes to zero in object map update path\n\nIn a reply message to an RBD request, a positive result code indicates\na data payload, which is not allowed for writes. While\nrbd_osd_req_callback() already resets a positive result code for writes\nto zero, rbd_object_map_callback() does not. This allows a corrupted\nreply to an object map update to trigger the rbd_assert(*result < 0) in\n__rbd_obj_handle_request(). This happens, because\nrbd_object_map_callback() calls rbd_obj_handle_request() ->\n__rbd_obj_handle_request() and passes this positive result code. From\n__rbd_obj_handle_request(), rbd_obj_advance_write() is called, which\nleaves the positive result code unchanged and returns true. Therefore,\nthe if(done && *result) branch is executed in __rbd_obj_handle_request()\nand the assertion triggers.\n\nThis patch fixes the issue by adjusting the logic in the\nrbd_object_map_callback() path. A positive result code for an object map\nupdate is now reset to zero (similar to rbd_osd_req_callback()), and the\nmessage is subsequently handled the same way as if the result code was\nzero from the beginning. Additionally, a WARN_ON_ONCE() is added for\nthis case."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The crash is triggered when libceph processes a crafted MOSDOpReply over the Ceph TCP connection and passes a positive r_result into rbd_object_map_callback(); a compromised or malicious OSD/monitor peer can deliver this without any local syscall on the victim.\nAC:L - An attacker controlling the Ceph OSD can deterministically reply to any object-map update request with a positive result code whenever the mapped image has RBD_FEATURE_OBJECT_MAP and write I/O is in flight, with no race or victim-specific memory layout required.\nPR:N - No privileges on the victim host are needed; exploitation only requires the kernel RBD client to be connected to an attacker-controlled or compromised Ceph cluster, consistent with other libceph client CVE scoring where the remote storage peer drives the bug.\nUI:N - After RBD is mapped, object-map updates are driven automatically by block-layer write I/O; no further interactive user action is required at exploit time beyond normal background storage activity on the mapped device.\nS:U - The BUG() panic affects only the kernel on the host running the RBD client and does not cross VM, container, or IOMMU security boundaries to another authority.\nC:N - The vulnerable path returns immediately on a positive result without decoding reply payload or corrupting memory; impact is limited to an assertion failure with no information disclosure primitive.\nI:N - No kernel or user data is modified; the positive result code is mishandled and triggers rbd_assert(*result < 0) leading to BUG(), not an arbitrary write or code-execution primitive.\nA:H - RBD_DEBUG is unconditionally defined so rbd_assert() invokes BUG(), causing a kernel panic that fully denies availability on any host with an affected RBD mapping when a malicious OSD reply is received."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/rbd.c"],"versions":[{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"cf1167292f606deaddac35ec384eba48f08a68d2","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"da926959bf791441ba06a80571708c3d0d3cc08f","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"6f33d9d539fb94e5a17589c2dfe271ff9bb64904","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"2419aa74081007dc4d14ff5640659052dfdfd69a","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"34f2a2f32af570dfcc532ad70c080629ee1c32b0","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"b1a61366933224b3ad80975c4d01ac2cc6931ecf","status":"affected","versionType":"git"},{"version":"22e8bd51bb0469d1a524130a057f894ff632376a","lessThan":"a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/rbd.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","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":"5.3","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cf1167292f606deaddac35ec384eba48f08a68d2"},{"url":"https://git.kernel.org/stable/c/da926959bf791441ba06a80571708c3d0d3cc08f"},{"url":"https://git.kernel.org/stable/c/6f33d9d539fb94e5a17589c2dfe271ff9bb64904"},{"url":"https://git.kernel.org/stable/c/14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b"},{"url":"https://git.kernel.org/stable/c/2419aa74081007dc4d14ff5640659052dfdfd69a"},{"url":"https://git.kernel.org/stable/c/34f2a2f32af570dfcc532ad70c080629ee1c32b0"},{"url":"https://git.kernel.org/stable/c/b1a61366933224b3ad80975c4d01ac2cc6931ecf"},{"url":"https://git.kernel.org/stable/c/a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4"}],"title":"rbd: Reset positive result codes to zero in object map update path","x_generator":{"engine":"bippy-1.2.0"}}}}