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CVE-2026-89476— sctp: fix stream->outcnt underflow on duplicate RECONF responses

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于SCTP处理重复RECONF响应时重复处理ADD_OUT请求，导致stream->outcnt被回滚两次并可能下溢。

CVSS 7.5 · High EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 041f7df5a929d3e7435dd8387e8ea17f2d412b7d affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 59f61c39cb99ee1737bd742a20094fe5653389bb affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 793519e343867ee9a3e84f6cac07f81f2aec7b5d affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 092acd3c55a4077b00489064615d8d2d898daf91 affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 2d867663c563e8009257b9edf9c8ec75d9bbf19a affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< d02a5794c3deedcb8476d017fcee2b7aaedab2e1 affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68 affected
11ae76e67a179f25ae8f772d62a7ddf717b1cdf3< 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e affected
… +10 more rows
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I. Basic Information for CVE-2026-89476

Vulnerability Information
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Vulnerability Title
sctp: fix stream->outcnt underflow on duplicate RECONF responses
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: fix stream->outcnt underflow on duplicate RECONF responses A cached RECONF chunk may contain more than one request parameter. A duplicate response can therefore find and process the same ADD_OUT request again while another parameter is still outstanding, rolling back outcnt twice and possibly underflowing it. Track outstanding request types as bits and clear each bit after its first response. Later responses for the same request are then ignored.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于SCTP处理重复RECONF响应时重复处理ADD_OUT请求，导致stream->outcnt被回滚两次并可能下溢。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 ~ 041f7df5a929d3e7435dd8387e8ea17f2d412b7d -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-89476

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III. Intelligence Information for CVE-2026-89476

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Patches & Fixes for CVE-2026-89476 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89476

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