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CVE-2026-74688— sctp: clear control chunk transport if it is being removed

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：若控制块关联的传输实体（transport）正在被移除，则清空控制块中的 transport 指针 函数在 中缓存了目的地传输实体，但未增加其引用计数。当启用 选项时，HEARTBEAT ACK 可能不会立即发送，而是保留在 队列中。 如果在 chunk 仍位于队列中时，对端传输实体被移除， 会释放该传输实体，并将其调度为 RCU 延迟释放，但仅清空了 中缓存的 transport 指针。因此，队列中的控制块仍保留一个悬空（dangling）的 transport

CVSS 9.8 · Critical EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8a07eb0a50aebc8c95478d49c28c7f8419a26cef< dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< fad4766a74220fe579c6fcaa10ba01c23529814f affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< 936658ec41c28c397ef390140e02d4c91ade92f0 affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< 8de65194a04d2552cd39b6c67d942d490f22d174 affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< 6160e756db81d6cb63e3e2952efcf6c5134be385 affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< 18d704bdd809377dfd81a3c2f42426763b5da227 affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 affected
8a07eb0a50aebc8c95478d49c28c7f8419a26cef< c9158ceaf27780ef64534ad72f44ffde3f8ccc49 affected
… +10 more rows
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I. Basic Information for CVE-2026-74688

Vulnerability Information
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Vulnerability Title
sctp: clear control chunk transport if it is being removed
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.
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 8a07eb0a50aebc8c95478d49c28c7f8419a26cef ~ dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 -
Linux Linux 3.1 -

II. Public POCs for CVE-2026-74688

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III. Intelligence Information for CVE-2026-74688

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Patches & Fixes for CVE-2026-74688 (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-2026-74662 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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
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-2026-74607 8.8 HIGH KVM: SVM: Serialize accesses to the owner and mirror list with separate lock

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74688

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