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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98380: net/sched: reject IDR error pointers when deleting actions

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 259caa711b7688365676442e2fdb286b8aceaa80, 39b751a210bf61a374afa82749afc7a77a08bf1d, 6bf076258aac4e0af69ef317656c31ce6444d647; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 259caa711b7688365676442e2fdb286b8aceaa80, 39b751a210bf61a374afa82749afc7a77a08bf1d, 6bf076258aac4e0af69ef317656c31ce6444d647; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Oct 9, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.19affected
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 39b751a210bf61a374afa82749afc7a77a08bf1daffected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before dd80a7519824b72c8fcfd3cc50cb93f7e2d90923affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 6bf076258aac4e0af69ef317656c31ce6444d647affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 6c9f07bf8800171de2cd3f02815cebe1f4d45f2daffected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 259caa711b7688365676442e2fdb286b8aceaa80affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 968550a439f64bd1a6c0d88efb92e4f082f84a26affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before a9551f26287debe6d8aa6e8841974661065b975faffected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before c82b797abe668d0b668601a93ba2c0b071a63574affected · git
    • before 4.19not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98378Oct 9, 2026 · bpf: Skip unsettled links in link iterator
    31Monitor
  • ← EarlierCVE-2026-98379Oct 9, 2026 · netfilter: ip6t_rpfilter: reject routes without inet6_dev
    0Monitor
  • Later →CVE-2026-98381Oct 9, 2026 · veth: manage XDP program pointers during channel resize
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux259caa711b7688365676442e2fdb286b8aceaa80Vendor (CNA)
Linux Linux39b751a210bf61a374afa82749afc7a77a08bf1dVendor (CNA)
Linux Linux6bf076258aac4e0af69ef317656c31ce6444d647Vendor (CNA)
Linux Linux6c9f07bf8800171de2cd3f02815cebe1f4d45f2dVendor (CNA)
Linux Linux968550a439f64bd1a6c0d88efb92e4f082f84a26Vendor (CNA)
Linux Linuxa9551f26287debe6d8aa6e8841974661065b975fVendor (CNA)
Linux Linuxc82b797abe668d0b668601a93ba2c0b071a63574Vendor (CNA)
Linux Linuxdd80a7519824b72c8fcfd3cc50cb93f7e2d90923Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.9-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+35 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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