264 lines
14 KiB
JSON
264 lines
14 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-2026-98257",
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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": "2026-09-25T10:25:14.332Z",
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"datePublished": "2026-10-06T08:45:22.722Z",
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"dateUpdated": "2026-10-19T09:16:28.470Z"
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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": "2026-10-19T09:16:28.470Z"
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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\nrds: ib: use rds_conn_drop() on protocol version mismatch\n\nrds_ib_cm_connect_complete() runs from the RDMA-CM event handler with\nconn->c_cm_lock held. When the peer negotiates a protocol version\nolder than RDS_PROTOCOL_COMPAT_VERSION, the handler calls\nrds_conn_destroy(), which is only safe in the rmmod path: it\nsynchronously tears the connection down and flush_work()es the\nshutdown work cp_down_w.\n\nThat shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is\nthe very lock the event handler still holds, so the flush never\ncompletes: the two workers wait on each other and the RDS connection\nworkqueues stall for good.\n\nAll other RDMA-CM failure paths (REJECTED, CONNECT_ERROR,\nDISCONNECTED) use rds_conn_drop(), which marks the connection\nRDS_CONN_ERROR and schedules the shutdown work asynchronously. Use\nit here as well."
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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 bad input is dp_protocol_major/minor in the peer's RDMA-CM REP private data, which rds_ib_cm_connect_complete() reads on RDMA_CM_EVENT_ESTABLISHED from rds_rdma_cm_event_handler_cmn(). RDS/IB runs over RoCEv2, whose CM messages travel over routable UDP/IP, so a remote peer supplies the version that hits the rds_conn_destroy() branch.\nAC:L - The attacker produces the active-side state: connect to the RDS listener, then disconnect. IB has no lower-address rule in rds_queue_reconnect(), so the hashed conn reconnects to the attacker, who replies with version 3.0. The deadlock then fires every time.\nPR:N - RDS/IB connection setup has no authentication. rds_ib_cm_handle_connect() only checks the protocol version from the request, and the REP private data the fix concerns is taken from the peer as-is.\nUI:N - No local user action is needed. The victim kernel's own reconnect worker (rds_connect_worker via rds_queue_reconnect) starts the outgoing connection after the attacker drops the first one.\nS:U - The impact is a deadlock inside the same kernel that processes the RDMA-CM event. No VM, IOMMU or sandbox boundary is crossed.\nC:N - rds_conn_destroy() blocks in flush_work(&cp->cp_down_w) before it reaches kmem_cache_free(), so the conn is never freed and then used. No memory is disclosed.\nI:N - No memory is corrupted. The fault is a lock-ordering deadlock between the CM handler holding c_cm_lock and rds_conn_shutdown() waiting for it, not a write to freed or out-of-bounds memory.\nA:H - The RDMA-CM event worker blocks forever in flush_work() while holding c_cm_lock, and the RDS shutdown work blocks on mutex_lock(&cp->cp_cm_lock). This stalls the RDS connection workqueues and CM event handling for good, and the attacker can repeat it against new connections."
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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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"net/rds/ib_cm.c"
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],
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"versions": [
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "424019be3f637da76b74f44a40034669acbb166f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "14fb90067d13f4494cff0f03243fae3cf2911cbc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "344c72a0bc2703a6de4918ed935850e07dae3af2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "b5c9f2951d330d4a198a64d6e60f79b4bd6ef078",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "d392b16acd0908f077289aad8bba066ff16de336",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "65ca0a5037152a5a80b8fe6aac80eb80458be573",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f147dd9ecabf23fd63d2562ffe64252a0453ecde",
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"lessThan": "f97d8c7bab7843631206a114986c9059da03efeb",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "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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"net/rds/ib_cm.c"
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],
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"versions": [
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{
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"version": "2.6.37",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.37",
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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": "5.10.271",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.112",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.54",
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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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "5.10.271"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "5.15.222"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "6.1.189"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "6.6.158"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "6.12.112"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "6.18.54"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "7.2.8"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.37",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/424019be3f637da76b74f44a40034669acbb166f"
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},
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{
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"url": "https://git.kernel.org/stable/c/14fb90067d13f4494cff0f03243fae3cf2911cbc"
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},
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{
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"url": "https://git.kernel.org/stable/c/344c72a0bc2703a6de4918ed935850e07dae3af2"
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},
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{
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"url": "https://git.kernel.org/stable/c/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078"
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},
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{
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"url": "https://git.kernel.org/stable/c/d392b16acd0908f077289aad8bba066ff16de336"
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},
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{
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"url": "https://git.kernel.org/stable/c/65ca0a5037152a5a80b8fe6aac80eb80458be573"
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},
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{
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"url": "https://git.kernel.org/stable/c/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8"
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},
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{
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"url": "https://git.kernel.org/stable/c/f97d8c7bab7843631206a114986c9059da03efeb"
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}
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],
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"title": "rds: ib: use rds_conn_drop() on protocol version mismatch",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |