Answer in brief
CVE-2026-89902 records a Unknown severity vulnerability in LoongArch: Avoid preempt count underflow without probe. 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 | >=6d4cc40fb5f58147defc6c0e9d86e6232fe31616 <ff40e597d5d98c0c45a4d09df8177202fac9520e || >=6d4cc40fb5f58147defc6c0e9d86e6232fe31616 <a1cb727fa27c2d9c7859729cd90db7bc0f46957f || >=6d4cc40fb5f58147defc6c0e9d86e6232fe31616 <76395109a051b53860faaec96522ef08ae9e8e27 || >=6d4cc40fb5f58147defc6c0e9d86e6232fe31616 <c4357ebeee63cb8da1446fc936573a34e68b0f71 || >=6d4cc40fb5f58147defc6c0e9d86e6232fe31616 <72ce4b24676e8b3b75376c4c559dd81c1ac52d5a | ff40e597d5d98c0c45a4d09df8177202fac9520e, a1cb727fa27c2d9c7859729cd90db7bc0f46957f, 76395109a051b53860faaec96522ef08ae9e8e27, c4357ebeee63cb8da1446fc936573a34e68b0f71, 72ce4b24676e8b3b75376c4c559dd81c1ac52d5a |
| Linux/Linuxgeneric | 6.3 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
In the Linux kernel, the following vulnerability has been resolved: LoongArch: Avoid preempt count underflow without probe LoongArch uses break 11 for the breakpoint placed after an instruction that Kprobes executes out of line. Since userspace can issue the same break instruction, do_bp() can reach kprobe_singlestep_handler() when there is no current probe. The handler actually returns false in this case, but it first calls preempt_enable_no_resched(). The corresponding preempt_disable() is done by kprobe_breakpoint_handler() on a real Kprobe hit, so it has not run here. As a result, an ordinary userspace breakpoint (code 11) underflows the current task's preempt count. This also makes in_interrupt() return true until the task schedules. One visible consequence is the socket cgroup attribution: cgroup_sk_alloc() treats the allocation as interrupt context and assigns the socket to the root cgroup. A socket opened from the SIGTRAP handler can then avoid a BPF_CGROUP_INET_SOCK_CREATE policy attached to the task's own cgroup. Return as soon as kprobe_running() reports no active probe. The same check has appeared in [PATCH v10 2/4] of the original LoongArch Kprobes series, but was dropped before the feature reached mainline.
Quoted source text, attributed separately from HOL analysis.