CVE-2026-89549

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89549", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.723Z", "datePublished": "2026-09-11T19:44:23.928Z", "dateUpdated": "2026-10-19T08:48:42.059Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:42.059Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: route to a populated pool in svc_pool_for_cpu()\n\nsvc_set_num_threads() spreads the requested threads evenly across the\nservice's pools (base = nrservs / sv_nrpools). When a service runs\nfewer threads than it has pools -- e.g. an nfsd configured with fewer\nthreads than the host has NUMA nodes while running in \"pernode\" or\n\"percpu\" mode -- the trailing pools are left with no threads at all.\n\nsvc_xprt_enqueue() selects a pool from the CPU servicing the transport,\nqueues the transport on that pool's sp_xprts, and only wakes a thread\nfrom the same pool. Each thread services exclusively its own pool, so a\ntransport that lands on a threadless pool is enqueued on sp_xprts and\nnever picked up: the connection hangs indefinitely.\n\nHave svc_pool_for_cpu() skip pools that currently have no threads,\nfalling back to the next populated pool. This trades NUMA locality for\na guarantee that the work is actually serviced. sp_nrthreads is only\nupdated under the service mutex; the lockless read here is a best-effort\nrouting hint, so annotate it with data_race()."}], "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 - nfsd is the in-kernel NFS server; inbound TCP/UDP/RDMA traffic hits svc_tcp_listen_data_ready/svc_data_ready then svc_xprt_enqueue() and svc_pool_for_cpu() before any RPC decode, so a remote peer reaches the bug over the wire.\nAC:L - On NUMA nfsd hosts using pernode/percpu pools with fewer threads than pools, a remote peer can open connections or send datagrams until RSS/softirq lands the listener or shared UDP xprt on an empty pool; the attacker controls that fan-out and no race or layout luck is required.\nPR:N - Enqueue runs in the socket data_ready path on the first TCP connect or UDP datagram to nfsd, before RPC parsing or AUTH_SYS/RPCSEC_GSS, so an unauthenticated network peer needs no local account or capability.\nUI:N - No victim action is required; an already-running NFS server automatically processes inbound connections and packets through the sunrpc transport callbacks.\nS:U - The hang is confined to the host kernel's sunrpc/nfsd threads and sockets and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is a transport-scheduling hang with no memory corruption, out-of-bounds access, or other primitive that could disclose kernel or file data.\nI:N - A transport stuck on a threadless pool is never serviced, so RPC operations are not executed and no kernel or filesystem state is modified.\nA:H - A transport enqueued on a threadless pool stays XPT_BUSY and is never dequeued; aging skips busy sockets, so a stuck listener or shared UDP xprt permanently stops NFS accept/recv until nfsd restarts."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/svc.c"], "versions": [{"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "9accc25e5af0bac8479f6054e674b2c593c45281", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "6f66d38e2a6c78d48723ea17ad86135ec80ca24b", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "edb20e8c03aebacb409968c99d046f509c6c485a", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "011479cf9a7657d4a3e7cc42a784ac63df594170", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "9d04d64ad192439835ed9884d767353061c3ed6f", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "8f766d2d0b4dabf54f8b35812df2b4f481d13316", "status": "affected", "versionType": "git"}, {"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "f6310491c4cdb88af73aa551ec9df1f10a90c709", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/svc.c"], "versions": [{"version": "2.6.19", "status": "affected"}, {"version": "0", "lessThan": "2.6.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "2.6.19", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281"}, {"url": "https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b"}, {"url": "https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"}, {"url": "https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a"}, {"url": "https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170"}, {"url": "https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f"}, {"url": "https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316"}, {"url": "https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"}], "title": "sunrpc: route to a populated pool in svc_pool_for_cpu()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89549", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:44.786723Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:42.959Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89549", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:44.786723Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:23:45.768Z"}}], "cna": {"title": "sunrpc: route to a populated pool in svc_pool_for_cpu()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - nfsd is the in-kernel NFS server; inbound TCP/UDP/RDMA traffic hits svc_tcp_listen_data_ready/svc_data_ready then svc_xprt_enqueue() and svc_pool_for_cpu() before any RPC decode, so a remote peer reaches the bug over the wire.\nAC:L - On NUMA nfsd hosts using pernode/percpu pools with fewer threads than pools, a remote peer can open connections or send datagrams until RSS/softirq lands the listener or shared UDP xprt on an empty pool; the attacker controls that fan-out and no race or layout luck is required.\nPR:N - Enqueue runs in the socket data_ready path on the first TCP connect or UDP datagram to nfsd, before RPC parsing or AUTH_SYS/RPCSEC_GSS, so an unauthenticated network peer needs no local account or capability.\nUI:N - No victim action is required; an already-running NFS server automatically processes inbound connections and packets through the sunrpc transport callbacks.\nS:U - The hang is confined to the host kernel's sunrpc/nfsd threads and sockets and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is a transport-scheduling hang with no memory corruption, out-of-bounds access, or other primitive that could disclose kernel or file data.\nI:N - A transport stuck on a threadless pool is never serviced, so RPC operations are not executed and no kernel or filesystem state is modified.\nA:H - A transport enqueued on a threadless pool stays XPT_BUSY and is never dequeued; aging skips busy sockets, so a stuck listener or shared UDP xprt permanently stops NFS accept/recv until nfsd restarts."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "9accc25e5af0bac8479f6054e674b2c593c45281", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "6f66d38e2a6c78d48723ea17ad86135ec80ca24b", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "edb20e8c03aebacb409968c99d046f509c6c485a", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "011479cf9a7657d4a3e7cc42a784ac63df594170", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "9d04d64ad192439835ed9884d767353061c3ed6f", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "8f766d2d0b4dabf54f8b35812df2b4f481d13316", "versionType": "git"}, {"status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "lessThan": "f6310491c4cdb88af73aa551ec9df1f10a90c709", "versionType": "git"}], "programFiles": ["net/sunrpc/svc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sunrpc/svc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281"}, {"url": "https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b"}, {"url": "https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"}, {"url": "https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a"}, {"url": "https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170"}, {"url": "https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f"}, {"url": "https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316"}, {"url": "https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: route to a populated pool in svc_pool_for_cpu()\n\nsvc_set_num_threads() spreads the requested threads evenly across the\nservice's pools (base = nrservs / sv_nrpools). When a service runs\nfewer threads than it has pools -- e.g. an nfsd configured with fewer\nthreads than the host has NUMA nodes while running in \"pernode\" or\n\"percpu\" mode -- the trailing pools are left with no threads at all.\n\nsvc_xprt_enqueue() selects a pool from the CPU servicing the transport,\nqueues the transport on that pool's sp_xprts, and only wakes a thread\nfrom the same pool. Each thread services exclusively its own pool, so a\ntransport that lands on a threadless pool is enqueued on sp_xprts and\nnever picked up: the connection hangs indefinitely.\n\nHave svc_pool_for_cpu() skip pools that currently have no threads,\nfalling back to the next populated pool. This trades NUMA locality for\na guarantee that the work is actually serviced. sp_nrthreads is only\nupdated under the service mutex; the lockless read here is a best-effort\nrouting hint, so annotate it with data_race()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "2.6.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:42.059Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89549", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:48:42.059Z", "dateReserved": "2026-09-11T19:38:34.723Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:23.928Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/svc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9accc25e5af0bac8479f6054e674b2c593c45281", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "6f66d38e2a6c78d48723ea17ad86135ec80ca24b", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "edb20e8c03aebacb409968c99d046f509c6c485a", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "011479cf9a7657d4a3e7cc42a784ac63df594170", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "9d04d64ad192439835ed9884d767353061c3ed6f", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "8f766d2d0b4dabf54f8b35812df2b4f481d13316", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}, {"lessThan": "f6310491c4cdb88af73aa551ec9df1f10a90c709", "status": "affected", "version": "bfd241600a3b0db4fe43c859f1460d0a958d924a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/svc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"lessThan": "2.6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nsunrpc: route to a populated pool in svc_pool_for_cpu()\n\nsvc_set_num_threads() spreads the requested threads evenly across the\nservice's pools (base = nrservs / sv_nrpools). When a service runs\nfewer threads than it has pools -- e.g. an nfsd configured with fewer\nthreads than the host has NUMA nodes while running in \"pernode\" or\n\"percpu\" mode -- the trailing pools are left with no threads at all.\n\nsvc_xprt_enqueue() selects a pool from the CPU servicing the transport,\nqueues the transport on that pool's sp_xprts, and only wakes a thread\nfrom the same pool. Each thread services exclusively its own pool, so a\ntransport that lands on a threadless pool is enqueued on sp_xprts and\nnever picked up: the connection hangs indefinitely.\n\nHave svc_pool_for_cpu() skip pools that currently have no threads,\nfalling back to the next populated pool. This trades NUMA locality for\na guarantee that the work is actually serviced. sp_nrthreads is only\nupdated under the service mutex; the lockless read here is a best-effort\nrouting hint, so annotate it with data_race()."}], "id": "CVE-2026-89549", "lastModified": "2026-10-19T09:17:50.103", "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-2026-89549", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:23:44.786723Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:38.373", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: sunrpc connection hang due to threadless pool routing", "id": "2532409", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532409"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["A flaw was found in the `sunrpc` component of the Linux kernel. When the `nfsd` service runs with fewer threads than available pools, a transport can be routed to a pool with no active threads. This prevents the connection from being processed, causing it to hang indefinitely. This can lead to a Denial of Service (DoS) condition for affected services."], "name": "CVE-2026-89549", "public_date": "2026-09-11T19:44:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89549\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89549\nhttps://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170\nhttps://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316\nhttps://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f\nhttps://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd241600a3b0db4fe43c859f1460d0a958d924a,011479cf9a7657d4a3e7cc42a784ac63df594170)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd241600a3b0db4fe43c859f1460d0a958d924a,9d04d64ad192439835ed9884d767353061c3ed6f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd241600a3b0db4fe43c859f1460d0a958d924a,8f766d2d0b4dabf54f8b35812df2b4f481d13316)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfd241600a3b0db4fe43c859f1460d0a958d924a,f6310491c4cdb88af73aa551ec9df1f10a90c709)"}}], "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": "2.6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-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": "2026-09-12T07:15:10.614603+00:00", "updated": "2026-09-15T22:00:17.678053+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}