Answer in brief
CVE-2026-89796 records a Unknown severity vulnerability in mm/damon/core: avoid infinite kdamond_merge_regions() internal loop. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), 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), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1e865019cef354a5f0314491b4b4fc9f9a613642 <407da1dd7f48e5ba22ceb8834f6923390632d025 || >=d7eda72e59bbf3ed592db7ff0fd8c246c73149a8 <65edd8b3a88278c9f8e5c7d8c15d4f296ce35078 || >=11078e2d11465518a9e85096bd28f8cd5fa1ea41 <5b0953f86d65855dc901050f40bbe6da0475d198 || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <769c16699c89811386eb003c8fd9dcb8d405b316 || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <50a7a5aec1aa43efc297fd4377c1cbdc7d15620d || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <8a96a06e04d210845be5d9581c0e9e338947e8f8 || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <123e4619ab6c8ab1c4cb1d7a58311a2af13929cd || f2bd3184b6aeca6a497394b558337246e09fc02d || >=5.15.164 <5.15.222 || >=6.1.101 <6.1.189 || >=6.6.41 <6.6.158 || >=6.9.10 <6.10 | 407da1dd7f48e5ba22ceb8834f6923390632d025, 65edd8b3a88278c9f8e5c7d8c15d4f296ce35078, 5b0953f86d65855dc901050f40bbe6da0475d198, 769c16699c89811386eb003c8fd9dcb8d405b316, 50a7a5aec1aa43efc297fd4377c1cbdc7d15620d, 8a96a06e04d210845be5d9581c0e9e338947e8f8, 123e4619ab6c8ab1c4cb1d7a58311a2af13929cd, 5.15.222, 6.1.189, 6.6.158, 6.10 |
| Linux/Linuxgeneric | 6.10 | Not reported |
| Linux/Linuxgeneric | >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <8a96a06e04d210845be5d9581c0e9e338947e8f8 || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <123e4619ab6c8ab1c4cb1d7a58311a2af13929cd || 1e865019cef354a5f0314491b4b4fc9f9a613642 || d7eda72e59bbf3ed592db7ff0fd8c246c73149a8 || 11078e2d11465518a9e85096bd28f8cd5fa1ea41 || f2bd3184b6aeca6a497394b558337246e09fc02d || >=5.15.164 <5.16 || >=6.1.101 <6.2 || >=6.6.41 <6.7 || >=6.9.10 <6.10 | 8a96a06e04d210845be5d9581c0e9e338947e8f8, 123e4619ab6c8ab1c4cb1d7a58311a2af13929cd, 5.16, 6.2, 6.7, 6.10 |
| Linux/Linuxgeneric | >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <769c16699c89811386eb003c8fd9dcb8d405b316 || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <50a7a5aec1aa43efc297fd4377c1cbdc7d15620d || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <8a96a06e04d210845be5d9581c0e9e338947e8f8 || >=310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 <123e4619ab6c8ab1c4cb1d7a58311a2af13929cd || 1e865019cef354a5f0314491b4b4fc9f9a613642 || d7eda72e59bbf3ed592db7ff0fd8c246c73149a8 || 11078e2d11465518a9e85096bd28f8cd5fa1ea41 || f2bd3184b6aeca6a497394b558337246e09fc02d || >=5.15.164 <5.16 || >=6.1.101 <6.2 || >=6.6.41 <6.7 || >=6.9.10 <6.10 | 769c16699c89811386eb003c8fd9dcb8d405b316, 50a7a5aec1aa43efc297fd4377c1cbdc7d15620d, 8a96a06e04d210845be5d9581c0e9e338947e8f8, 123e4619ab6c8ab1c4cb1d7a58311a2af13929cd, 5.16, 6.2, 6.7, 6.10 |
Published upstream
Sep 16, 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 16, 2026
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: avoid infinite kdamond_merge_regions() internal loop Patch series "mm/damon: unurgent fixes for infinite loop, NULL de-ref and races", v1.1. Sashiko found a few issues in DAMON that could cause infinite loop, NULL dereference and monitoring results degradation. The first two sounds scary but the infinite loop happens only under unreasonable user setup. The NULL dereference is only in a unit test. Monitoring results degradation is trivial since it is only best-effort, and those happens from only unlikely races. Still those are bugs that better to fix if possible. Fix those. This patch (of 6): Due to online parameter update like events, the number of DAMON regions could be higher than the user-set upper limit. kdamond_merge_regions() repeats merge regions until the number meets the limit, while doubling the merge threshold up to the theoretical maximum threshold. It is tried only up to the theoretical maximum threshold because even the aggressive merging can fail from reducing the number of regions under the user-defined upper limit. For example, there could be many user-defined non-contiguous regions that cannot be merged. The threshold based loop break condition is evaluated by comparing the threshold for the next merging try against the theoretical maximum threshold. If max_thres is larger than UINT_MAX / 2, doubling the threshold could make it overflow, and bypass the loop break condition. In the case, if the number of regions cannot be reduced under the upper limit like explained above, the loop will run infinitely. Prevent the case by doing the break condition check before doubling the threshold. Also, prevent the threshold exceeding the maximum threshold, as it could overflow and apply the wrong merge threshold. This issue is unlikely to occur in real world, since having the max_thres higher than UINT_MAX / 2 require unrealistically large aggregation intervals compared to the sampling interval. Also, it requires an unrealistically large number of uncontiguous regions setup. Nonetheless, the consequence is bad and the fix is simple. The issue was discovered [1] by Sashiko.
Quoted source text, attributed separately from HOL analysis.