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CVE-2026-52929— sctp: stream: fully roll back denied add-stream state

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.15版本存在安全漏洞，该漏洞源于SCTP流添加被拒绝时仅缩减队列和降低outcnt，导致移除的流元数据残留，后续重新添加可能重用过时扩展并在调度器获取路径中触发空指针取消引用。

CVSS 7.5 · High EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1564 · Hide Artifacts

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 637784ade221a3c8a7ecd0f583eddd95d6276b9a< 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< a6724b7b812ac8793514a1d5938db5d9d29ae725 affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< 9662eb0401518f0b4681f10e7fbf688f504f24cf affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< 7dd9a42b044aad2dbe037db1c1e2943582485b44 affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< 39dc2b0eb5371a669ebc9ec6072b9184eac95418 affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< d5ea0b3e261fcb2cfff142675516165244cab1da affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< 1c6773b8c081509dcd5cd2954f2b02c50c00f151 affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a< a5f8a90ac9f77c678a9781c0a464b635e0d63e49 affected
… +10 more rows
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I. Basic Information for CVE-2026-52929

Vulnerability Information
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Vulnerability Title
sctp: stream: fully roll back denied add-stream state
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.15版本存在安全漏洞，该漏洞源于SCTP流添加被拒绝时仅缩减队列和降低outcnt，导致移除的流元数据残留，后续重新添加可能重用过时扩展并在调度器获取路径中触发空指针取消引用。
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 637784ade221a3c8a7ecd0f583eddd95d6276b9a ~ 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-52929

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III. Intelligence Information for CVE-2026-52929

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Patches & Fixes for CVE-2026-52929 (7)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52929

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