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CVE-2026-98130— sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： SCTP：修复 SCTP_CMD_TIMER_START 中的竞态条件（TOCTOU） SCTP_CMD_TIMER_START 处理器在调用 timer_reduce() 之前检查 timer_pending()。但在这些操作之间，定时器可能已过期并脱离关联，导致 timer_reduce() 在重新设置定时器时未获取该新激活定时器所需的关联引用。 后续定时器回调函数会无条件释放其关联引用，从而导致关联引用计数失衡，并在关联终止过程中引发 Use-After-Free（释

CVSS 8.1 · High EPSS 0.52% · P41

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 20a785aa52c82246055a089e55df9dac47d67da1< e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9 affected
20a785aa52c82246055a089e55df9dac47d67da1< 00b841bac10230c557be6b38efc48508198fe23e affected
20a785aa52c82246055a089e55df9dac47d67da1< 3d698d1e6c8bc41e3e1707777a016f1bdd07842d affected
20a785aa52c82246055a089e55df9dac47d67da1< 2188569e7e1b0bc3f3b557dc97ab7a02befc11c8 affected
9c0a4652f750afe3b4468cbcd9335b244ce2facd affected
70989e501fbce502198d82da88358ce453575a05 affected
085bb270b4b1168c93afb37bbafc881207d15443 affected
4.19.126< 4.20 affected
… +8 more rows
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I. Basic Information for CVE-2026-98130

Vulnerability Information
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Vulnerability Title
sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START The SCTP_CMD_TIMER_START handler checks timer_pending() before calling timer_reduce(). The timer can expire and detach between these operations, causing timer_reduce() to rearm the timer without taking the association reference required for the newly armed timer. The timer callback later unconditionally drops its association reference, which can leave the association reference count unbalanced and result in use-after-free during association teardown. Use the return value of timer_reduce() to determine whether the timer was actually armed. Take the association reference only when timer_reduce() successfully starts a new timer, closing the race between checking the timer state and rearming it. This issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero Day Initiative.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 20a785aa52c82246055a089e55df9dac47d67da1 ~ e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-98130

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III. Intelligence Information for CVE-2026-98130

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Patches & Fixes for CVE-2026-98130 (4)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-97991 7.8 HIGH vdpa_sim_blk: reject out-of-range sector starts
CVE-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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