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CVE-2026-74587— sctp: fix use-after-free of cached ASCONF chunk

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：修复缓存的 ASCONF 块使用的使用后释放（use-after-free）漏洞 会缓存待发送的 ASCONF 块。正常的 ASCONF-ACK 完成路径会释放该块并清空指针。 然而， 在释放缓存块时并未清空 指针。在对等体重启处理过程中， 会入队 命令，从而调用 。此时关联（association）仍然处于活跃状态，导致该指针变为悬垂指针。 随后，一个延迟的经过身份验证的 ASCONF-ACK 可能到达 ，该函数访问了过期的块，并将其传递给 ，从而导致使用后释放

CVSS 9.8 · Critical EPSS 0.22% · P13

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a000c01e60e40e15304ffe48fff051d17a7bea91< 10459b03e2d9ee12435e96f587de4d4cacdbf435 affected
a000c01e60e40e15304ffe48fff051d17a7bea91< e1bb114e09372fd6e03387ced9ef566da336ed6c affected
a000c01e60e40e15304ffe48fff051d17a7bea91< 179676f0166230c80053a392303485b37c93dd33 affected
a000c01e60e40e15304ffe48fff051d17a7bea91< dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d affected
a000c01e60e40e15304ffe48fff051d17a7bea91< 618b5c6d049896fcfabb91afc072954c92cb2693 affected
a000c01e60e40e15304ffe48fff051d17a7bea91< 07daf4f9750104960a1d60831b2353c0d41f35fb affected
a000c01e60e40e15304ffe48fff051d17a7bea91< d949992bc3f00027a2c755e860a11950c75f6073 affected
a000c01e60e40e15304ffe48fff051d17a7bea91< 8c283e7b56adce00193837f3311b06662466fb21 affected
… +10 more rows
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I. Basic Information for CVE-2026-74587

Vulnerability Information
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Vulnerability Title
sctp: fix use-after-free of cached ASCONF chunk
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free of cached ASCONF chunk addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal ASCONF-ACK completion path releases the chunk and clears the pointer. However, sctp_asconf_queue_teardown() releases the cached chunk without clearing addip_last_asconf. During peer restart handling, sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes sctp_asconf_queue_teardown() while the association remains alive and leaves the pointer dangling. A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(), which accesses the stale chunk and passes it to sctp_process_asconf_ack(), causing a use-after-free and a second release. Clearing the pointer exposes a race with T4 expiry. Peer restart handling queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses timer_delete(), which does not wait for a callback already running on another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after the purge and dereference NULL. Clear addip_last_asconf after releasing the cached chunk, and make sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding ASCONF remains.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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 a000c01e60e40e15304ffe48fff051d17a7bea91 ~ 10459b03e2d9ee12435e96f587de4d4cacdbf435 -
Linux Linux 3.0 -

II. Public POCs for CVE-2026-74587

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III. Intelligence Information for CVE-2026-74587

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Patches & Fixes for CVE-2026-74587 (8)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment
CVE-2026-74629 8.8 HIGH net/dibs: Correct freeing of dmb_clientid_arr

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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