310 lines
16 KiB
JSON
310 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-68131",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-30T09:28:09.370Z",
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"datePublished": "2026-08-10T11:58:54.155Z",
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"dateUpdated": "2026-10-19T20:58:52.688Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-19T16:29:49.752Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/block/rbd.c"
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],
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{
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"product": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/block/rbd.c"
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],
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"version": "5.3",
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"status": "affected"
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{
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"version": "0",
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"lessThan": "5.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.148",
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"status": "unaffected",
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},
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{
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"version": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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}
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],
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"title": "rbd: Reset positive result codes to zero in object map update path",
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"type": "ssvc",
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"id": "CVE-2026-68131",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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}
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}
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