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CVE-2026-98586— sctp: hold asoc or transport before mod_timer() in timer handlers

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，以下漏洞已得到修复： sctp：在定时器处理程序中调用 mod_timer() 之前，必须先持有关联（asoc）或传输（transport）的引用。 在定时器处理程序中重新设置定时器之前，必须先获取关联或传输的引用。 现有代码在获取重新设置定时器所需的引用之前，就先调用了 mod_timer()，且此时并未持有套接字锁。这会导致与定时器清理路径竞争：如果定时器在 mod_timer() 返回之后、但引用获取之前被删除，清理路径可能会释放定时器的引用并销毁传输或关联对象。随后，定时器处理程序会

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1069.006

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f9d929026d487a988bfa12c065f892e823e5b6ab affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9d3d39da054476e7aa05cd877b93ca73a9a77434 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 27c51a9b55b227309161c903f9ecfbf022516bc2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 35bf3b23c9a871f44c1453d85f8332be4e088dda affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cae23ae3f7887a1cf8a75da38edcebeef695040f affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-98586

Vulnerability Information
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Vulnerability Title
sctp: hold asoc or transport before mod_timer() in timer handlers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association. The timer handler then takes a reference on the already freed object and eventually drops it, causing a refcount underflow. Hold the object before mod_timer() and drop the reference if mod_timer() reports that the timer was already pending in timer handlers. Apply the same ordering to the proto-unreachable path, which can rearm a transport timer outside the timer handlers without holding the sock lock.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-98586

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III. Intelligence Information for CVE-2026-98586

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Patches & Fixes for CVE-2026-98586 (7)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98568 vxlan: use one headroom snapshot for neighbour replies
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98574 net: bcmgenet: stop Tx NAPI before disabling the queues
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98595 udp: remove a disconnected socket from the 4-tuple hash table

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98586

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