Answer in brief
CVE-2026-98380 records a Unknown severity vulnerability in net/sched: reject IDR error pointers when deleting actions. 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 | >=0190c1d452a91c38a3462abdd81752be1b9006a8 <39b751a210bf61a374afa82749afc7a77a08bf1d || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <dd80a7519824b72c8fcfd3cc50cb93f7e2d90923 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <6bf076258aac4e0af69ef317656c31ce6444d647 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <6c9f07bf8800171de2cd3f02815cebe1f4d45f2d || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <259caa711b7688365676442e2fdb286b8aceaa80 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <968550a439f64bd1a6c0d88efb92e4f082f84a26 || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <a9551f26287debe6d8aa6e8841974661065b975f || >=0190c1d452a91c38a3462abdd81752be1b9006a8 <c82b797abe668d0b668601a93ba2c0b071a63574 | 39b751a210bf61a374afa82749afc7a77a08bf1d, dd80a7519824b72c8fcfd3cc50cb93f7e2d90923, 6bf076258aac4e0af69ef317656c31ce6444d647, 6c9f07bf8800171de2cd3f02815cebe1f4d45f2d, 259caa711b7688365676442e2fdb286b8aceaa80, 968550a439f64bd1a6c0d88efb92e4f082f84a26, a9551f26287debe6d8aa6e8841974661065b975f, c82b797abe668d0b668601a93ba2c0b071a63574 |
| Linux/Linuxgeneric | 4.19 | Not reported |
Published upstream
Oct 9, 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 9, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: reject IDR error pointers when deleting actions tcf_action_delete() drops the reference held by its lookup before calling tcf_idr_delete_index() with the saved action index. An unlocked classifier can remove that action and reserve the same IDR slot with ERR_PTR(-EBUSY) in between. tcf_idr_delete_index() only checks the lookup result for NULL. It therefore treats the reservation as a tc_action and dereferences tcfa_bindcnt. A hardware execution breakpoint was used to schedule the interleaving without changing the kernel source. KASAN reported this decoded trace: BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010 Read of size 4 at addr 0000000000000010 by task poc/150 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002 RIP: tca_action_gd+0x5c0/0x1010: arch_atomic_read at arch/x86/include/asm/atomic.h:23 raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457 atomic_read at include/linux/atomic/atomic-instrumented.h:33 tcf_idr_delete_index at net/sched/act_api.c:766 tcf_action_delete at net/sched/act_api.c:1859 tcf_del_notify at net/sched/act_api.c:2014 tca_action_gd at net/sched/act_api.c:2064 R13: 0000000000000010 R15: fffffffffffffff0 Kernel panic - not syncing: Fatal exception R15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces the address in R13. With the guard applied, the same reproducer returned -ENOENT without a KASAN report or panic. Treat error pointers as absent and return -ENOENT.
Quoted source text, attributed separately from HOL analysis.