Answer in brief
CVE-2026-31458 records a Unknown severity vulnerability in mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]. 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 | >=0ac32b8affb5a384253dbb8339bd2d0e91add0b7 <aba546061341b56e9ffb37e1eb661a3628b6ec12 || >=0ac32b8affb5a384253dbb8339bd2d0e91add0b7 <1e8da792672481d603fa7cd0d815577220a3ee27 || >=0ac32b8affb5a384253dbb8339bd2d0e91add0b7 <708033c231bd782858f4ddbb46ee874a5a5fbdab || >=0ac32b8affb5a384253dbb8339bd2d0e91add0b7 <bbe03ad3fb9e714191757ca7b41582f930be7be2 || >=0ac32b8affb5a384253dbb8339bd2d0e91add0b7 <1bfe9fb5ed2667fb075682408b776b5273162615 | aba546061341b56e9ffb37e1eb661a3628b6ec12, 1e8da792672481d603fa7cd0d815577220a3ee27, 708033c231bd782858f4ddbb46ee874a5a5fbdab, bbe03ad3fb9e714191757ca7b41582f930be7be2, 1bfe9fb5ed2667fb075682408b776b5273162615 |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Apr 22, 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: mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0] Multiple sysfs command paths dereference contexts_arr[0] without first verifying that kdamond->contexts->nr == 1. A user can set nr_contexts to 0 via sysfs while DAMON is running, causing NULL pointer dereferences. In more detail, the issue can be triggered by privileged users like below. First, start DAMON and make contexts directory empty (kdamond->contexts->nr == 0). # damo start # cd /sys/kernel/mm/damon/admin/kdamonds/0 # echo 0 > contexts/nr_contexts Then, each of below commands will cause the NULL pointer dereference. # echo update_schemes_stats > state # echo update_schemes_tried_regions > state # echo update_schemes_tried_bytes > state # echo update_schemes_effective_quotas > state # echo update_tuned_intervals > state Guard all commands (except OFF) at the entry point of damon_sysfs_handle_cmd().
Quoted source text, attributed separately from HOL analysis.