{"api_version":"1","generated_at":"2026-10-01T06:31:14+00:00","cve":"CVE-2026-97958","urls":{"html":"https://cve.report/CVE-2026-97958","api":"https://cve.report/api/cve/CVE-2026-97958.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97958","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97958"},"summary":{"title":"net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().\n\nIf a netlink socket sends RTM_GETCHAIN requests repeatedly\nwithout recv()ing the responses, tc_ctl_chain() hogs CPU and\ntriggers Hung Task splat. [0]\n\nAs caught in the stack trace, netlink_attachskb() could confuse\ntc_ctl_chain() by returning -EAGAIN when the userspace netlink\nsocket's receive buffer is full.\n\nThe replay: label exists since commit 32a4f5ecd738 (\"net: sched:\nintroduce chain object to uapi\") but was not used initially.\n\nSince commit 9f407f1768d3 (\"net: sched: introduce chain templates\"),\nthe label is needed for RTM_NEWCHAIN because tcf_proto_lookup_ops()\nmay release RTNL to call request_module().\n\nHowever, the replay logic is unnecessary for RTM_GETCHAIN.\n\nLet's apply the replay logic only for RTM_NEWCHAIN.\n\n[0]:\nINFO: task repro:1018 is blocked on a mutex likely owned by task repro:1022.\ntask:repro           state:R  running task     stack:14096 pid:1022  tgid:1014  ppid:961    task_flags:0x400040 flags:0x00080000\nCall Trace:\n <TASK>\n ? clockevents_program_event (kernel/time/clockevents.c:372)\n ? pskb_expand_head (net/core/skbuff.c:615)\n ? skb_release_data (net/core/skbuff.c:1122)\n ? netlink_attachskb (./include/linux/skbuff.h:1323 ./include/linux/skbuff.h:1332 net/netlink/af_netlink.c:1232)\n ? __netlink_lookup (./include/linux/rcupdate.h:882 ./include/linux/rhashtable.h:711 net/netlink/af_netlink.c:499)\n ? tc_chain_notify (net/sched/cls_api.c:3045)\n ? tc_chain_notify (./include/linux/skbuff.h:1384 net/sched/cls_api.c:3041)\n ? netlink_unicast (net/netlink/af_netlink.c:1335)\n ? rtnl_unicast (./include/net/netlink.h:1198 net/core/rtnetlink.c:985)\n ? tc_ctl_chain (net/sched/cls_api.c:3242)\n ? rtnetlink_rcv_msg (net/core/rtnetlink.c:7146)\n ? netlink_unicast (net/netlink/af_netlink.c:1354)\n ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:7177)\n ? netlink_rcv_skb (net/netlink/af_netlink.c:2556)\n ? netlink_unicast (net/netlink/af_netlink.c:1319)\n ? netlink_sendmsg (net/netlink/af_netlink.c:1900)\n ? __sock_sendmsg (net/socket.c:800)\n ? __sys_sendto (net/socket.c:2281)\n ? __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)\n ? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)\n ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:23","updated_at":"2026-09-25 11:17:23"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/503ba58481e3ba69d28127d35a39cec529f9670c","name":"https://git.kernel.org/stable/c/503ba58481e3ba69d28127d35a39cec529f9670c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a1c2840d95af1fa3d83ba71e23fa0c674a4c6796","name":"https://git.kernel.org/stable/c/a1c2840d95af1fa3d83ba71e23fa0c674a4c6796","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e9ac395bb56122a057d0aa91a6b55d9e3fa37c26","name":"https://git.kernel.org/stable/c/e9ac395bb56122a057d0aa91a6b55d9e3fa37c26","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dff39930ad5e53d202bfdfb14687d1d2fd753b4d","name":"https://git.kernel.org/stable/c/dff39930ad5e53d202bfdfb14687d1d2fd753b4d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97958","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97958","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2ed9db3074fcd8d12709fe40ff0e691d74229818 a1c2840d95af1fa3d83ba71e23fa0c674a4c6796 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2ed9db3074fcd8d12709fe40ff0e691d74229818 503ba58481e3ba69d28127d35a39cec529f9670c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2ed9db3074fcd8d12709fe40ff0e691d74229818 e9ac395bb56122a057d0aa91a6b55d9e3fa37c26 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2ed9db3074fcd8d12709fe40ff0e691d74229818 dff39930ad5e53d202bfdfb14687d1d2fd753b4d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"97958","cve":"CVE-2026-97958","epss":"0.001680000","percentile":"0.054070000","score_date":"2026-09-27","updated_at":"2026-09-28 00:02:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/cls_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a1c2840d95af1fa3d83ba71e23fa0c674a4c6796","status":"affected","version":"2ed9db3074fcd8d12709fe40ff0e691d74229818","versionType":"git"},{"lessThan":"503ba58481e3ba69d28127d35a39cec529f9670c","status":"affected","version":"2ed9db3074fcd8d12709fe40ff0e691d74229818","versionType":"git"},{"lessThan":"e9ac395bb56122a057d0aa91a6b55d9e3fa37c26","status":"affected","version":"2ed9db3074fcd8d12709fe40ff0e691d74229818","versionType":"git"},{"lessThan":"dff39930ad5e53d202bfdfb14687d1d2fd753b4d","status":"affected","version":"2ed9db3074fcd8d12709fe40ff0e691d74229818","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.19"},{"lessThan":"4.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"4.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().\n\nIf a netlink socket sends RTM_GETCHAIN requests repeatedly\nwithout recv()ing the responses, tc_ctl_chain() hogs CPU and\ntriggers Hung Task splat. [0]\n\nAs caught in the stack trace, netlink_attachskb() could confuse\ntc_ctl_chain() by returning -EAGAIN when the userspace netlink\nsocket's receive buffer is full.\n\nThe replay: label exists since commit 32a4f5ecd738 (\"net: sched:\nintroduce chain object to uapi\") but was not used initially.\n\nSince commit 9f407f1768d3 (\"net: sched: introduce chain templates\"),\nthe label is needed for RTM_NEWCHAIN because tcf_proto_lookup_ops()\nmay release RTNL to call request_module().\n\nHowever, the replay logic is unnecessary for RTM_GETCHAIN.\n\nLet's apply the replay logic only for RTM_NEWCHAIN.\n\n[0]:\nINFO: task repro:1018 is blocked on a mutex likely owned by task repro:1022.\ntask:repro           state:R  running task     stack:14096 pid:1022  tgid:1014  ppid:961    task_flags:0x400040 flags:0x00080000\nCall Trace:\n <TASK>\n ? clockevents_program_event (kernel/time/clockevents.c:372)\n ? pskb_expand_head (net/core/skbuff.c:615)\n ? skb_release_data (net/core/skbuff.c:1122)\n ? netlink_attachskb (./include/linux/skbuff.h:1323 ./include/linux/skbuff.h:1332 net/netlink/af_netlink.c:1232)\n ? __netlink_lookup (./include/linux/rcupdate.h:882 ./include/linux/rhashtable.h:711 net/netlink/af_netlink.c:499)\n ? tc_chain_notify (net/sched/cls_api.c:3045)\n ? tc_chain_notify (./include/linux/skbuff.h:1384 net/sched/cls_api.c:3041)\n ? netlink_unicast (net/netlink/af_netlink.c:1335)\n ? rtnl_unicast (./include/net/netlink.h:1198 net/core/rtnetlink.c:985)\n ? tc_ctl_chain (net/sched/cls_api.c:3242)\n ? rtnetlink_rcv_msg (net/core/rtnetlink.c:7146)\n ? netlink_unicast (net/netlink/af_netlink.c:1354)\n ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:7177)\n ? netlink_rcv_skb (net/netlink/af_netlink.c:2556)\n ? netlink_unicast (net/netlink/af_netlink.c:1319)\n ? netlink_sendmsg (net/netlink/af_netlink.c:1900)\n ? __sock_sendmsg (net/socket.c:800)\n ? __sys_sendto (net/socket.c:2281)\n ? __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)\n ? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)\n ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>"}],"providerMetadata":{"dateUpdated":"2026-09-25T10:23:03.753Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a1c2840d95af1fa3d83ba71e23fa0c674a4c6796"},{"url":"https://git.kernel.org/stable/c/503ba58481e3ba69d28127d35a39cec529f9670c"},{"url":"https://git.kernel.org/stable/c/e9ac395bb56122a057d0aa91a6b55d9e3fa37c26"},{"url":"https://git.kernel.org/stable/c/dff39930ad5e53d202bfdfb14687d1d2fd753b4d"}],"title":"net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-97958","datePublished":"2026-09-25T10:23:03.753Z","dateReserved":"2026-09-25T10:18:58.205Z","dateUpdated":"2026-09-25T10:23:03.753Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:23","lastModifiedDate":"2026-09-25 11:17:23","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97958","Ordinal":"1","Title":"net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().","CVE":"CVE-2026-97958","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97958","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().\n\nIf a netlink socket sends RTM_GETCHAIN requests repeatedly\nwithout recv()ing the responses, tc_ctl_chain() hogs CPU and\ntriggers Hung Task splat. [0]\n\nAs caught in the stack trace, netlink_attachskb() could confuse\ntc_ctl_chain() by returning -EAGAIN when the userspace netlink\nsocket's receive buffer is full.\n\nThe replay: label exists since commit 32a4f5ecd738 (\"net: sched:\nintroduce chain object to uapi\") but was not used initially.\n\nSince commit 9f407f1768d3 (\"net: sched: introduce chain templates\"),\nthe label is needed for RTM_NEWCHAIN because tcf_proto_lookup_ops()\nmay release RTNL to call request_module().\n\nHowever, the replay logic is unnecessary for RTM_GETCHAIN.\n\nLet's apply the replay logic only for RTM_NEWCHAIN.\n\n[0]:\nINFO: task repro:1018 is blocked on a mutex likely owned by task repro:1022.\ntask:repro           state:R  running task     stack:14096 pid:1022  tgid:1014  ppid:961    task_flags:0x400040 flags:0x00080000\nCall Trace:\n <TASK>\n ? clockevents_program_event (kernel/time/clockevents.c:372)\n ? pskb_expand_head (net/core/skbuff.c:615)\n ? skb_release_data (net/core/skbuff.c:1122)\n ? netlink_attachskb (./include/linux/skbuff.h:1323 ./include/linux/skbuff.h:1332 net/netlink/af_netlink.c:1232)\n ? __netlink_lookup (./include/linux/rcupdate.h:882 ./include/linux/rhashtable.h:711 net/netlink/af_netlink.c:499)\n ? tc_chain_notify (net/sched/cls_api.c:3045)\n ? tc_chain_notify (./include/linux/skbuff.h:1384 net/sched/cls_api.c:3041)\n ? netlink_unicast (net/netlink/af_netlink.c:1335)\n ? rtnl_unicast (./include/net/netlink.h:1198 net/core/rtnetlink.c:985)\n ? tc_ctl_chain (net/sched/cls_api.c:3242)\n ? rtnetlink_rcv_msg (net/core/rtnetlink.c:7146)\n ? netlink_unicast (net/netlink/af_netlink.c:1354)\n ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:7177)\n ? netlink_rcv_skb (net/netlink/af_netlink.c:2556)\n ? netlink_unicast (net/netlink/af_netlink.c:1319)\n ? netlink_sendmsg (net/netlink/af_netlink.c:1900)\n ? __sock_sendmsg (net/socket.c:800)\n ? __sys_sendto (net/socket.c:2281)\n ? __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)\n ? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)\n ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>","Type":"Description","Title":"net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain()."}]}}}