{ "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" } } } }