{"metadata": {"vulnerability": "CVE-2026-98869", "count": 20, "kinds": {"milestone": 7, "sighting": 1, "kev": 0, "other": 12}}, "data": [{"timestamp": "2026-09-25T10:25:14.377Z", "date_only": false, "value": "2026-09-25T10:25:14.377Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-98869", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-21T14:55:10.364Z", "date_only": false, "value": "2026-10-21T14:55:10.364Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-98869", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-21T15:17:00Z", "date_only": false, "value": "2026-10-21T15:17:00Z", "kind": "milestone", "label": "Published", "source": "osv_ubuntu \u00b7 UBUNTU-CVE-2026-98869", "record": "UBUNTU-CVE-2026-98869", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-21T15:17:19Z", "date_only": false, "value": "2026-10-21T15:17:19Z", "kind": "other", "label": "Nvd published at", "source": "github \u00b7 GHSA-M2XX-FFWM-822C", "record": "GHSA-M2XX-FFWM-822C", "field": "database_specific.nvd_published_at", "linked_record": true}, {"timestamp": "2026-10-21T15:17:19.827Z", "date_only": false, "value": "2026-10-21T15:17:19.827", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-98869", "record": "FKIE_CVE-2026-98869", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-21T15:42:33Z", "date_only": false, "value": "2026-10-21T15:42:33Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-M2XX-FFWM-822C", "record": "GHSA-M2XX-FFWM-822C", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-21T18:28:49.189Z", "date_only": false, "value": "2026-10-21T18:28:49.189218Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117480313886696438", "record": "CVE-2026-98869", "field": "creation_timestamp", "uuid": "7d985e37-4134-4440-9581-3db3d9810967", "content": "CVE-2026-98869 bpf: Infer zext_dst based on static register liveness analysis In the Linux kernel, the following vulnerability has been resolved:\nbpf: Infer zext_dst based on static register liveness analysis\nAs reported in the thread [1], the verifier's 32-bit operations zeroextension logic is broken. This logic is responsible for correctsemantics of 32-bit operations on s390 architecture.\nAccording to BPF semantics, operation `w1 += 1` is supposed to zeroextend the upper half of the register `r1`. On s390 the JIT relies onthe verifier emitting explicit zero extension before such operations.\nThe verifier attempts to minimize the amount of zero extensionsinserted by tracking whether upper halves of the 64-bit registers areever used. Previously such tracking worked as follows:\n- bpf_reg_state->subreg_def field was set by do_check_insn()  for each operation defining lower but not the upper halves  of the register.- Whenever an operation reading the whole register was verified,  the verifier checked register's subreg_def and set  bpf_insn_aux_data->zext_dst flag as true via a call to  mark_insn_zext() function.- After the verification was complete, a special pass  bpf_opt_subreg_zext_lo32_rnd_hi32() extended 32-bit operations  with bpf_insn_aux_data->zext_dst set as true by adding  explicit zero extension.\nNote that the logic above relies on bpf_reg_state->subreg_def,which is a property of a current verifier state.Before the commit [2] two additional steps happened:\n- The verifier tracked upper and lower register halves' liveness as  flags REG_LIVE_READ{32,64} in bpf_reg_state->live.- The function propagate_liveness() called mark_insn_zext()  in order to transfer the knowledge about which registers have  their upper halves alive (and thus might require zero extension).\nThe commit [2] removed the two steps described above,hence making possible a situation like below:\n- The register's upper half is set and is used on some verification  path P1 and the register happens not to be marked as precise.- The checkpoint C is created while processing some instruction  between register initialization and usage.- On some other verification path P2 the register's upper half is not  initialized and that path ends hitting the checkpoint C.- In such a case the register's initialization on path P2 would lack  zext_dst mark, making it possible for the program to inject  an arbitrary value in the register's upper half.\nThis commit replaces subreg_def based logic with computing zext_dststatically, as a part of the bpf_compute_live_registers() analysis:\n- The analysis now tracks usage of upper and lower halves of the  registers separately.- If some instruction defines a 32-bit subregister, but not the whole  register, *and* the upper half of the register is alive after that  instruction, the instruction is marked as zext_dst.\nThere is one notable drop in precision: whenever a BPF subprogram iscalled, all 64 bits of parameter registers are presumed to be used.The assumption is that such a drop in precision would not inflicta noticeable performance penalty.\n[1] https://lore.kernel.org/bpf/CAGKGUv=sOuqQtA1Ub-5JXfA4FPosJFYKAQE4B79cK+P1erxqtg@mail.gmail.com/[2] commit 107e16979905 (\"bpf: disable and remove registers chain based liveness\")\nhttps://www.cve.org/CVERecord?id=CVE-2026-98869https://git.kernel.org/stable/c/7ce090afbf725e25fff29caacce1eaf8459b1117#kernel #Linux#CVE_2026_98869#bot", "url": "https://infosec.exchange/users/cve/statuses/117480313886696438"}, {"timestamp": "2026-10-21T22:00:00Z", "date_only": false, "value": "2026-10-21T22:00:00.000+00:00", "kind": "other", "label": "Advisory revision", "source": "csaf_certbund \u00b7 WID-SEC-W-2026-4097", "record": 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