Answer in brief
CVE-2026-23140 records a Unknown severity vulnerability in bpf, test_run: Subtract size of xdp_frame from allowed metadata size. 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 | >=b6f1f780b3932ae497ed85e79bc8a1e513883624 <e7440935063949d6f2c10f7328d960d0ff4bce90 || >=b6f1f780b3932ae497ed85e79bc8a1e513883624 <7c81ad5e580bd8441f8a521a8d34824ce6582ae5 || >=b6f1f780b3932ae497ed85e79bc8a1e513883624 <6447e697cfa8a43a8e491cb81bcc390d0f28f8ba || >=b6f1f780b3932ae497ed85e79bc8a1e513883624 <31e37f44b60679d90b9f999c91371b15291be8e0 || >=b6f1f780b3932ae497ed85e79bc8a1e513883624 <e558cca217790286e799a8baacd1610bda31b261 | e7440935063949d6f2c10f7328d960d0ff4bce90, 7c81ad5e580bd8441f8a521a8d34824ce6582ae5, 6447e697cfa8a43a8e491cb81bcc390d0f28f8ba, 31e37f44b60679d90b9f999c91371b15291be8e0, e558cca217790286e799a8baacd1610bda31b261 |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Feb 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf, test_run: Subtract size of xdp_frame from allowed metadata size The xdp_frame structure takes up part of the XDP frame headroom, limiting the size of the metadata. However, in bpf_test_run, we don't take this into account, which makes it possible for userspace to supply a metadata size that is too large (taking up the entire headroom). If userspace supplies such a large metadata size in live packet mode, the xdp_update_frame_from_buff() call in xdp_test_run_init_page() call will fail, after which packet transmission proceeds with an uninitialised frame structure, leading to the usual Bad Stuff. The commit in the Fixes tag fixed a related bug where the second check in xdp_update_frame_from_buff() could fail, but did not add any additional constraints on the metadata size. Complete the fix by adding an additional check on the metadata size. Reorder the checks slightly to make the logic clearer and add a comment.
Quoted source text, attributed separately from HOL analysis.