Answer in brief
CVE-2026-98590 records a Unknown severity vulnerability in bpf: Fix bpf_sock context code generation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 5.8 | Not reported |
| Linux/Linuxgeneric | >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <e3ddcf4aeb342d4de2e5761c7042270d454752de || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <4a41d064facc3330e176ecbbf5b0026ed18a5c69 || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <70288599d1754e157df8326239316dbdf08ea33c || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <ea4dc96c902ccfa49dd3e4f23c443dab4a74b018 || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73 || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <84ebb991ae985149079ae9ab51b7e3ba25a9ff53 || >=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <4a4852376e3a2727ea40e61143d6d7c22bb6dfad | e3ddcf4aeb342d4de2e5761c7042270d454752de, 4a41d064facc3330e176ecbbf5b0026ed18a5c69, 70288599d1754e157df8326239316dbdf08ea33c, ea4dc96c902ccfa49dd3e4f23c443dab4a74b018, b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73, d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c, 84ebb991ae985149079ae9ab51b7e3ba25a9ff53, 4a4852376e3a2727ea40e61143d6d7c22bb6dfad |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sock context code generation Currently, the ctx access code reads the rx_queue_mapping field with either a 4-byte or 2-byte load. The rest of the bits in the register are marked known zero by the verifier. However, the emitted ctx access code places in the register on certain the special value (-1) using BPF_MOV_IMM64, which gets sign-extended to turn on all the bits in the register. By shifting this value right, the program ends up with a value at runtime above what the verifier assumes is possible. Fix this by ensuring the read value is as wide as the assumed size. Use MOV32 instructions instead of MOV64 instructions to keep the upper bits zero as assumed by the verifier. Also properly report the size of the destination variable (the bpf_sock field, 4 bytes) instead of the source (the socket field, 2 bytes).
Quoted source text, attributed separately from HOL analysis.