Answer in brief
CVE-2026-98629 records a Unknown severity vulnerability in net/sched: cls_u32: fix manual hash table handle IDR aliasing. 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 | >=9b2c3184e126b941dfa716b8128ed6db92a64e2f <21fc07924e996e1e661268ca269c86b8d59d25b3 || >=789f9963bd031c3a185605665b744912df8e7eda <0fac292d93fdb313099e98cce928b3a524c92c94 || >=73af53d82076bbe184d9ece9e14b0dc8599e6055 <54a454c5e41f5e2cb70c8163140ce095c5d5eefd || >=73af53d82076bbe184d9ece9e14b0dc8599e6055 <f6696481eedfd5752b4b56eed715d0b0fe48b9c5 || >=73af53d82076bbe184d9ece9e14b0dc8599e6055 <2f898f9ec7c73c5697ee462681e7ea6984ee1f3d || >=73af53d82076bbe184d9ece9e14b0dc8599e6055 <0a5f5d9e94dead312d32c366b917c64e552b72f7 || 4403f9293ce9ecc2a55c688d84ee37e3ba0fc1a8 || >=6.1.119 <6.1.189 || >=6.6.63 <6.6.158 || >=6.11.10 <6.12 | 21fc07924e996e1e661268ca269c86b8d59d25b3, 0fac292d93fdb313099e98cce928b3a524c92c94, 54a454c5e41f5e2cb70c8163140ce095c5d5eefd, f6696481eedfd5752b4b56eed715d0b0fe48b9c5, 2f898f9ec7c73c5697ee462681e7ea6984ee1f3d, 0a5f5d9e94dead312d32c366b917c64e552b72f7, 6.1.189, 6.6.158, 6.12 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: fix manual hash table handle IDR aliasing A u32 hash table created with an explicit handle ('tc filter add ... handle 801: u32 divisor N') keys its IDR entry on the raw handle, while the destroy paths free it under handle2id(handle). The two key domains disagree for handles in the 0x800..0xFFF htid range: handle2id() folds them back into the auto-allocated id space (1..0x7FF). A manual table therefore leaves its raw-keyed IDR entry unreachable on delete (a permanent leak), and its delete can drop the idr entry of an unrelated live auto table. A later auto allocation can then hand out a handle that aliases the live manual table; u32_lookup_ht() first-match routes lookups and TCA_U32_LINK for that htid to the wrong table. Key the divisor-path alloc on handle2id(handle) so allocation and removal share one key domain. A manual handle that maps onto an id already in use is rejected with -ENOSPC, and auto allocation skips ids held by live manual tables. Conditions to recreate: ip link add test0 type dummy tc qdisc add dev test0 clsact tc filter add dev test0 ingress protocol ip pref 1 \ handle 801: u32 divisor 16 tc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16 tc -d filter show dev test0 ingress | grep 'fh 801:' # unpatched: two live tables with handle 0x80100000 (the pref 2 root # hnode is auto-allocated id 1); patched: the auto hnode takes id 2. Also tested with a poc with a live u32 table on the block, add/delete a manual table 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with -ENOSPC because the raw key leaked on the first delete.
Quoted source text, attributed separately from HOL analysis.