Answer in brief
CVE-2026-31742 records a High severity (CVSS 7.8) vulnerability in vt: discard stale unicode buffer on alt screen exit after resize. 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.
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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c4efef65a46f610418a3f69149c51492d31c8591 <891d790fdb5c96c6e1d2841e06ee6c360f2d1288 || >=1cf66bd9127447c57295f5199029e8d8b47c6c67 <428fdf55301e6c8fa5a36b426240797b1cf86570 || >=5eb608319bb56464674a71b4a66ea65c6c435d64 <40014493cece72a0be5672cd86763e53fb3ec613 | 891d790fdb5c96c6e1d2841e06ee6c360f2d1288, 428fdf55301e6c8fa5a36b426240797b1cf86570, 40014493cece72a0be5672cd86763e53fb3ec613 |
| Linux/Linuxgeneric | >=6.18.20 <6.18.22 || >=6.19.10 <6.19.12 | 6.18.22, 6.19.12 |
Published upstream
May 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: vt: discard stale unicode buffer on alt screen exit after resize When enter_alt_screen() saves vc_uni_lines into vc_saved_uni_lines and sets vc_uni_lines to NULL, a subsequent console resize via vc_do_resize() skips reallocating the unicode buffer because vc_uni_lines is NULL. However, vc_saved_uni_lines still points to the old buffer allocated for the original dimensions. When leave_alt_screen() later restores vc_saved_uni_lines, the buffer dimensions no longer match vc_rows/vc_cols. Any operation that iterates over the unicode buffer using the current dimensions (e.g. csi_J clearing the screen) will access memory out of bounds, causing a kernel oops: BUG: unable to handle page fault for address: 0x0000002000000020 RIP: 0010:csi_J+0x133/0x2d0 The faulting address 0x0000002000000020 is two adjacent u32 space characters (0x20) interpreted as a pointer, read from the row data area past the end of the 25-entry pointer array in a buffer allocated for 80x25 but accessed with 240x67 dimensions. Fix this by checking whether the console dimensions changed while in the alternate screen. If they did, free the stale saved buffer instead of restoring it. The unicode screen will be lazily rebuilt via vc_uniscr_check() when next needed.
Quoted source text, attributed separately from HOL analysis.