Answer in brief
CVE-2026-74371 records a High severity (CVSS 7.8) vulnerability in bpf: fix BPF_PROG_QUERY OOB write and cgroup backward compat. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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.
CVSS is 7.8. 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1209339844601ec1766f4ff430673fbcfe42bb51 <a7131340d0f95df9a541257dccab5d85e6bcdd2b || >=1209339844601ec1766f4ff430673fbcfe42bb51 <d3d630e8a7f3421bc2d204b87bdff35b4432a8e3 || >=1209339844601ec1766f4ff430673fbcfe42bb51 <21c4b99b27f3f85b89256e81b3e997dec0a460d0 | a7131340d0f95df9a541257dccab5d85e6bcdd2b, d3d630e8a7f3421bc2d204b87bdff35b4432a8e3, 21c4b99b27f3f85b89256e81b3e997dec0a460d0 |
| Linux/Linuxgeneric | 6.17 | Not reported |
| Linux/Linuxgeneric | >=195814a38a6a712bcb44d3dfa5109e926e92bec4 <b78eb6efbf052d44a3a14726aa7c7d5aa2e544d7 || >=1209339844601ec1766f4ff430673fbcfe42bb51 <a7131340d0f95df9a541257dccab5d85e6bcdd2b || >=1209339844601ec1766f4ff430673fbcfe42bb51 <d3d630e8a7f3421bc2d204b87bdff35b4432a8e3 || >=1209339844601ec1766f4ff430673fbcfe42bb51 <21c4b99b27f3f85b89256e81b3e997dec0a460d0 | b78eb6efbf052d44a3a14726aa7c7d5aa2e544d7, a7131340d0f95df9a541257dccab5d85e6bcdd2b, d3d630e8a7f3421bc2d204b87bdff35b4432a8e3, 21c4b99b27f3f85b89256e81b3e997dec0a460d0 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: fix BPF_PROG_QUERY OOB write and cgroup backward compat BPF_PROG_QUERY writes back the 'query.revision' field unconditionally to userspace. If userspace passes a smaller 'bpf_attr' structure (e.g. 40 bytes, which was the layout before the addition of 'query.revision'), the kernel performs an out-of-bounds write. Fix this by propagating the user-provided attribute size 'uattr_size' down to the cgroup query handlers, and conditionally skipping writing the revision field to userspace when the provided buffer size is insufficient. query.revision in bpf_mprog_query is structurally identical to the cgroup case: a late tail field, written unconditionally. But the backward-compat hazard is not the same. The min-historical-size test is per command, and bpf_mprog_query only serves attach types that were born with revision in the struct: - tcx_prog_query -> BPF_TCX_INGRESS/EGRESS - netkit_prog_query -> BPF_NETKIT_PRIMARY/PEER tcx, netkit, the revision field, and bpf_mprog_query itself all landed in the same v6.6 merge window (053c8e1f235d added the mprog query API + revision; tcx in e420bed02507, netkit in 35dfaad7188c). There has never been a tcx/netkit BPF_PROG_QUERY userspace that doesn't know about revision. So for these commands the minimum legitimate struct already covers offset 56-64 — no old binary can be broken here. Contrast with cgroup: BPF_PROG_QUERY on cgroup attach types shipped in 2017; revision write-back was bolted on years later (120933984460). That path has a real population of pre-revision callers.
Quoted source text, attributed separately from HOL analysis.