CVE-2026-72464

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72464", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.933Z", "datePublished": "2026-08-15T05:57:08.080Z", "dateUpdated": "2026-10-16T18:55:25.140Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:30.706Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Repost Receive buffers for malformed replies\n\nrpcrdma_wc_receive() decrements the transport's Receive count for\nevery completion before it dispatches a successful Receive to\nrpcrdma_reply_handler(). The handler must post a replacement\nReceive WR before returning unless ownership of the rep has moved\nelsewhere, as on the backchannel path.\n\nCommit 2ae50ad68cd7 (\"xprtrdma: Close window between waking RPC\nsenders and posting Receives\") moved the Receive refill out of\nrpcrdma_wc_receive(), where it had run ahead of every reply, into\nrpcrdma_reply_handler() so that the responder's credit grant could\nbe parsed before reposting. The bad-version and short-reply exits\nnever reach that refill: they recycle the rep and return without\ncalling rpcrdma_post_recvs().\n\nA remote peer can therefore drain the client's posted Receive\nqueue by sending a sustained stream of replies that are shorter\nthan the fixed transport header or that carry an unrecognized\nRPC/RDMA version. Each such reply consumes one posted Receive\nwithout replacing it. Once the queue empties, the peer's next\nSend finds no posted Receive and the transport stalls until\nreconnect.\n\nRoute both malformed-reply exits through the shared repost tail\nafter recycling the rep, refilling against buf->rb_credits, the\nmost recent accepted credit grant. Neither exit updates the\ncongestion window, so RPCs admitted under the previous grant\nremain in flight awaiting replies. A smaller refill target would\nlet a stream of malformed replies ratchet the posted Receive count\ndown to the batch floor while the congestion window still admits\nrb_credits RPCs; a burst of valid replies to those RPCs could then\noverrun the posted Receives, and because the client connects with\nrnr_retry_count of zero, a single RNR NAK terminates the\nconnection. Refilling against rb_credits also restores the target\nthat applied to malformed replies before commit 2ae50ad68cd7\n(\"xprtrdma: Close window between waking RPC senders and posting\nReceives\") when rpcrdma_post_recvs() computed it from rb_credits\ninternally. rb_credits is at least one from connection\nestablishment onward, so the repost path always keeps Receives\nposted."}], "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 - Malicious or compromised NFS/RDMA server sends malformed RPC reply messages over an established RDMA connection; the kernel client processes them in rpcrdma_wc_receive()/rpcrdma_reply_handler() without any local access.\nAC:L - Remote server reliably triggers the bug by streaming replies shorter than the fixed RPC/RDMA header or carrying an unrecognized version; each consumes a posted Receive without reposting a replacement.\nPR:N - Attacker needs no credentials on the victim host, only the ability to act as the connected RDMA peer (e.g., a malicious or compromised NFS server the client has mounted).\nUI:N - Exploitation requires only an active NFS-over-RDMA client session; no additional victim action is needed beyond an existing mount/connection used for normal I/O.\nS:U - Impact is confined to SunRPC/RDMA transport availability on the NFS client; it does not cross VM, container, or kernel/user security boundaries.\nC:N - No memory corruption or out-of-bounds access occurs; short or bad-version replies are detected during header decode and the buffer is recycled without disclosing kernel data.\nI:N - The flaw only fails to repost Receive buffers after malformed replies; it does not corrupt memory, alter RPC payloads, or enable arbitrary kernel writes.\nA:H - Sustained malformed replies drain all posted Receives, stalling the transport until reconnect; a burst of valid replies can trigger RNR NAK and disconnect (rnr_retry_count=0), denying NFS/RDMA service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c"], "versions": [{"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "ef6fb8a5c521f1a07f85202d13e8f2898f247362", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "4322fd9645ee769ad29ce5caea74a1cd9b17269d", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "19fae02b272ee4bcdfb5db57f402d28f1697167a", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "007b4da2f38dcc16a13265416f4ca9f179bab610", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "d7c531ab477ae94fd03771d707fd29c787408039", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5", "status": "affected", "versionType": "git"}, {"version": "3791c5982ba1eebf2900ee7ca7b9a89619c26d54", "status": "affected", "versionType": "git"}, {"version": "5.4.13", "lessThan": "5.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "5.5", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5"}], "title": "xprtrdma: Repost Receive buffers for malformed replies", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72464", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:50:20.084963Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:25.140Z"}}]}}

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each consumes a posted Receive without reposting a replacement.\nPR:N - Attacker needs no credentials on the victim host, only the ability to act as the connected RDMA peer (e.g., a malicious or compromised NFS server the client has mounted).\nUI:N - Exploitation requires only an active NFS-over-RDMA client session; no additional victim action is needed beyond an existing mount/connection used for normal I/O.\nS:U - Impact is confined to SunRPC/RDMA transport availability on the NFS client; it does not cross VM, container, or kernel/user security boundaries.\nC:N - No memory corruption or out-of-bounds access occurs; short or bad-version replies are detected during header decode and the buffer is recycled without disclosing kernel data.\nI:N - The flaw only fails to repost Receive buffers after malformed replies; it does not corrupt memory, alter RPC payloads, or enable arbitrary kernel writes.\nA:H - Sustained malformed replies drain all posted Receives, stalling the transport until reconnect; a burst of valid replies can trigger RNR NAK and disconnect (rnr_retry_count=0), denying NFS/RDMA service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "ef6fb8a5c521f1a07f85202d13e8f2898f247362", "versionType": "git"}, {"status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "4322fd9645ee769ad29ce5caea74a1cd9b17269d", "versionType": "git"}, {"status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "19fae02b272ee4bcdfb5db57f402d28f1697167a", "versionType": "git"}, {"status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "007b4da2f38dcc16a13265416f4ca9f179bab610", "versionType": "git"}, {"status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "d7c531ab477ae94fd03771d707fd29c787408039", "versionType": "git"}, {"status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5", "versionType": "git"}, {"status": "affected", "version": "3791c5982ba1eebf2900ee7ca7b9a89619c26d54", "versionType": "git"}, {"status": "affected", "version": "5.4.13", "lessThan": "5.5", "versionType": "semver"}], "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"status": "unaffected", "version": "0", "lessThan": "5.5", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/ef6fb8a5c521f1a07f85202d13e8f2898f247362"}, {"url": "https://git.kernel.org/stable/c/4322fd9645ee769ad29ce5caea74a1cd9b17269d"}, {"url": "https://git.kernel.org/stable/c/19fae02b272ee4bcdfb5db57f402d28f1697167a"}, {"url": "https://git.kernel.org/stable/c/007b4da2f38dcc16a13265416f4ca9f179bab610"}, {"url": "https://git.kernel.org/stable/c/d7c531ab477ae94fd03771d707fd29c787408039"}, {"url": "https://git.kernel.org/stable/c/abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Repost Receive buffers for malformed replies\n\nrpcrdma_wc_receive() decrements the transport's Receive count for\nevery completion before it dispatches a successful Receive to\nrpcrdma_reply_handler(). The handler must post a replacement\nReceive WR before returning unless ownership of the rep has moved\nelsewhere, as on the backchannel path.\n\nCommit 2ae50ad68cd7 (\"xprtrdma: Close window between waking RPC\nsenders and posting Receives\") moved the Receive refill out of\nrpcrdma_wc_receive(), where it had run ahead of every reply, into\nrpcrdma_reply_handler() so that the responder's credit grant could\nbe parsed before reposting. The bad-version and short-reply exits\nnever reach that refill: they recycle the rep and return without\ncalling rpcrdma_post_recvs().\n\nA remote peer can therefore drain the client's posted Receive\nqueue by sending a sustained stream of replies that are shorter\nthan the fixed transport header or that carry an unrecognized\nRPC/RDMA version. Each such reply consumes one posted Receive\nwithout replacing it. Once the queue empties, the peer's next\nSend finds no posted Receive and the transport stalls until\nreconnect.\n\nRoute both malformed-reply exits through the shared repost tail\nafter recycling the rep, refilling against buf->rb_credits, the\nmost recent accepted credit grant. Neither exit updates the\ncongestion window, so RPCs admitted under the previous grant\nremain in flight awaiting replies. A smaller refill target would\nlet a stream of malformed replies ratchet the posted Receive count\ndown to the batch floor while the congestion window still admits\nrb_credits RPCs; a burst of valid replies to those RPCs could then\noverrun the posted Receives, and because the client connects with\nrnr_retry_count of zero, a single RNR NAK terminates the\nconnection. Refilling against rb_credits also restores the target\nthat applied to malformed replies before commit 2ae50ad68cd7\n(\"xprtrdma: Close window between waking RPC senders and posting\nReceives\") when rpcrdma_post_recvs() computed it from rb_credits\ninternally. rb_credits is at least one from connection\nestablishment onward, so the repost path always keeps Receives\nposted."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:30.706Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72464", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:25.140Z", "dateReserved": "2026-08-09T03:40:39.933Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:57:08.080Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ef6fb8a5c521f1a07f85202d13e8f2898f247362", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "4322fd9645ee769ad29ce5caea74a1cd9b17269d", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "19fae02b272ee4bcdfb5db57f402d28f1697167a", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "007b4da2f38dcc16a13265416f4ca9f179bab610", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "d7c531ab477ae94fd03771d707fd29c787408039", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"status": "affected", "version": "3791c5982ba1eebf2900ee7ca7b9a89619c26d54", "versionType": "git"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.13", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"lessThan": "5.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Repost Receive buffers for malformed replies\n\nrpcrdma_wc_receive() decrements the transport's Receive count for\nevery completion before it dispatches a successful Receive to\nrpcrdma_reply_handler(). The handler must post a replacement\nReceive WR before returning unless ownership of the rep has moved\nelsewhere, as on the backchannel path.\n\nCommit 2ae50ad68cd7 (\"xprtrdma: Close window between waking RPC\nsenders and posting Receives\") moved the Receive refill out of\nrpcrdma_wc_receive(), where it had run ahead of every reply, into\nrpcrdma_reply_handler() so that the responder's credit grant could\nbe parsed before reposting. The bad-version and short-reply exits\nnever reach that refill: they recycle the rep and return without\ncalling rpcrdma_post_recvs().\n\nA remote peer can therefore drain the client's posted Receive\nqueue by sending a sustained stream of replies that are shorter\nthan the fixed transport header or that carry an unrecognized\nRPC/RDMA version. Each such reply consumes one posted Receive\nwithout replacing it. Once the queue empties, the peer's next\nSend finds no posted Receive and the transport stalls until\nreconnect.\n\nRoute both malformed-reply exits through the shared repost tail\nafter recycling the rep, refilling against buf->rb_credits, the\nmost recent accepted credit grant. Neither exit updates the\ncongestion window, so RPCs admitted under the previous grant\nremain in flight awaiting replies. A smaller refill target would\nlet a stream of malformed replies ratchet the posted Receive count\ndown to the batch floor while the congestion window still admits\nrb_credits RPCs; a burst of valid replies to those RPCs could then\noverrun the posted Receives, and because the client connects with\nrnr_retry_count of zero, a single RNR NAK terminates the\nconnection. Refilling against rb_credits also restores the target\nthat applied to malformed replies before commit 2ae50ad68cd7\n(\"xprtrdma: Close window between waking RPC senders and posting\nReceives\") when rpcrdma_post_recvs() computed it from rb_credits\ninternally. rb_credits is at least one from connection\nestablishment onward, so the repost path always keeps Receives\nposted."}], "id": "CVE-2026-72464", "lastModified": "2026-10-16T19:17:31.537", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72464", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:50:20.084963Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:20.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/007b4da2f38dcc16a13265416f4ca9f179bab610"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/19fae02b272ee4bcdfb5db57f402d28f1697167a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4322fd9645ee769ad29ce5caea74a1cd9b17269d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d7c531ab477ae94fd03771d707fd29c787408039"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef6fb8a5c521f1a07f85202d13e8f2898f247362"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: xprtrdma: Repost Receive buffers for malformed replies", "id": "2516385", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516385"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxprtrdma: Repost Receive buffers for malformed replies\nrpcrdma_wc_receive() decrements the transport's Receive count for\nevery completion before it dispatches a successful Receive to\nrpcrdma_reply_handler(). The handler must post a replacement\nReceive WR before returning unless ownership of the rep has moved\nelsewhere, as on the backchannel path.\nCommit 2ae50ad68cd7 (\"xprtrdma: Close window between waking RPC\nsenders and posting Receives\") moved the Receive refill out of\nrpcrdma_wc_receive(), where it had run ahead of every reply, into\nrpcrdma_reply_handler() so that the responder's credit grant could\nbe parsed before reposting. The bad-version and short-reply exits\nnever reach that refill: they recycle the rep and return without\ncalling rpcrdma_post_recvs().\nA remote peer can therefore drain the client's posted Receive\nqueue by sending a sustained stream of replies that are shorter\nthan the fixed transport header or that carry an unrecognized\nRPC/RDMA version. Each such reply consumes one posted Receive\nwithout replacing it. Once the queue empties, the peer's next\nSend finds no posted Receive and the transport stalls until\nreconnect.\nRoute both malformed-reply exits through the shared repost tail\nafter recycling the rep, refilling against buf->rb_credits, the\nmost recent accepted credit grant. Neither exit updates the\ncongestion window, so RPCs admitted under the previous grant\nremain in flight awaiting replies. A smaller refill target would\nlet a stream of malformed replies ratchet the posted Receive count\ndown to the batch floor while the congestion window still admits\nrb_credits RPCs; a burst of valid replies to those RPCs could then\noverrun the posted Receives, and because the client connects with\nrnr_retry_count of zero, a single RNR NAK terminates the\nconnection. Refilling against rb_credits also restores the target\nthat applied to malformed replies before commit 2ae50ad68cd7\n(\"xprtrdma: Close window between waking RPC senders and posting\nReceives\") when rpcrdma_post_recvs() computed it from rb_credits\ninternally. rb_credits is at least one from connection\nestablishment onward, so the repost path always keeps Receives\nposted.", "A flaw was found in the kernel's xprtrdma module. A remote attacker can exploit this by sending a sustained stream of malformed Remote Procedure Call over Remote Direct Memory Access (RPC/RDMA) replies. These malformed replies, which are either too short or carry an unrecognized RPC/RDMA version, can drain the client's receive queue. This ultimately leads to a Denial of Service (DoS) condition, causing the transport to stall until a reconnection occurs."], "name": "CVE-2026-72464", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72464\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72464\nhttps://lore.kernel.org/linux-cve-announce/2026081533-CVE-2026-72464-e38f@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ae50ad68cd79224198b525f7bd645c9da98b6ff,ef6fb8a5c521f1a07f85202d13e8f2898f247362)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ae50ad68cd79224198b525f7bd645c9da98b6ff,4322fd9645ee769ad29ce5caea74a1cd9b17269d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ae50ad68cd79224198b525f7bd645c9da98b6ff,19fae02b272ee4bcdfb5db57f402d28f1697167a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ae50ad68cd79224198b525f7bd645c9da98b6ff,007b4da2f38dcc16a13265416f4ca9f179bab610)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ae50ad68cd79224198b525f7bd645c9da98b6ff,d7c531ab477ae94fd03771d707fd29c787408039)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ae50ad68cd79224198b525f7bd645c9da98b6ff,abc011ddaf1617e3e82d8a1e87daa7ddbfb9bac5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3791c5982ba1eebf2900ee7ca7b9a89619c26d54"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.13,5.5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T17:45:03.070098+00:00", "updated": "2026-08-17T15:15:04.355624+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-770"]}