Answer in brief
CVE-2026-93167 records a Unknown severity vulnerability in csky: Fix a4/a5 restoration in syscall trace path. 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 | >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <e9ae8e86eed68bea5d2670eadf61938a43bd2263 || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <64e3ec7a71d3b715e2567f19f64207f04999bb0c || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <863fa63fd1491f201ac819f805a8db98d2a32c3d || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <31c81b376e5f058c7f2c94f69719cf7caec2fc3f || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <a776afa89424570bfa637ebf812ca281a5732904 || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <343aa5275484d627c921a42e8e115cae366be5de || >=e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 <abb81e5ce7d995baa41556b8125fa59e28ba3be8 || 108681048cf728a8570e036c34ebd7daa43133b4 || 3a5837c692918c229baf63fe7950965d27c48ac2 || >=5.4.47 <5.5 || >=5.6.19 <5.7 | e9ae8e86eed68bea5d2670eadf61938a43bd2263, 64e3ec7a71d3b715e2567f19f64207f04999bb0c, 863fa63fd1491f201ac819f805a8db98d2a32c3d, e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e, 31c81b376e5f058c7f2c94f69719cf7caec2fc3f, a776afa89424570bfa637ebf812ca281a5732904, 343aa5275484d627c921a42e8e115cae366be5de, abb81e5ce7d995baa41556b8125fa59e28ba3be8, 5.5, 5.7 |
| Linux/Linuxgeneric | 5.7 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: csky: Fix a4/a5 restoration in syscall trace path The syscall trace path reloads syscall arguments from pt_regs before calling the syscall handler. On C-SKY ABIv2, the 5th and 6th syscall arguments are prepared as stack arguments before invoking syscallid. The current code adjusts sp before loading LSAVE_A4 and LSAVE_A5. Since those offsets are relative to the original pt_regs base, loading them after changing sp fetches the wrong slots. As a result, traced syscalls that use the 5th or 6th argument may receive corrupted arguments. This is visible with mmap2(), which takes six arguments. A small PTRACE_SYSCALL reproducer opens a file and maps one page with: mmap(NULL, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0) Before the fix, the traced child fails the mmap and exits with 12. After the fix, the mapping succeeds and the child exits with 0. Fix the trace path by loading a4/a5 from pt_regs before changing sp. Tested on: ck860f, linux-4.19.15, C-SKY abiv2
Quoted source text, attributed separately from HOL analysis.