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CVE-2026-74586— sctp: clear new_transport when removing a peer

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，已解决以下漏洞： sctp：在移除对等端时清除 new_transport 会将新添加的对等端传输地址存储在 中。在处理完 ASCONF 块中的所有参数后， 会使用此指针向新传输地址发送 HEARTBEAT（心跳）消息。 来自远程 SCTP 对等端经认证的 ASCONF 消息可以在同一个块中添加一个传输地址，并使用通配符 DEL-IP 参数立即将其移除。通配符删除会保留接收该 ASCONF 消息的传输地址，但通过 移除新添加的传输地址。然而，移除操作并未清空 ，导致该指针仍指向已被移除的传输

CVSS 9.8 · Critical EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< c0f973bb5118dd1b146cda3fcc8af6f6057befec affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 3b539b317cd052236fed0350364ff1268996ba46 affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< db9d8e3b670f841755bc2018f178472dc6064d27 affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 31efa656cf6aface26e88f038c14f22ee6ca1500 affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 291accf36febce751021888de5f15090f4875b56 affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< ca33df36aa0143a1d04f57d2086020c12e7eddb7 affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 163847552a571bd55094291f4ffcdc1de0f14a7b affected
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3 affected
… +10 more rows
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I. Basic Information for CVE-2026-74586

Vulnerability Information
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Vulnerability Title
sctp: clear new_transport when removing a peer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: clear new_transport when removing a peer sctp_process_asconf_param() stores a newly added peer transport in asoc->new_transport. After all parameters in the ASCONF chunk have been processed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the new transport. An authenticated ASCONF from a remote SCTP peer can add a transport and remove it again with a wildcard DEL-IP parameter in the same chunk. The wildcard deletion preserves the transport on which the ASCONF arrived, but removes the newly added transport through sctp_assoc_del_nonprimary_peers(). The removal does not clear asoc->new_transport, leaving it pointing to the removed transport. sctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points to the removed transport without holding a transport reference. During local address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on control_chunk_list. After the transport is freed by RCU, a successful ASCONF_ACK for the replacement address releases the queued HEARTBEAT and sctp_outq_select_transport() reads the freed transport's state. The issue was found during a static audit of SCTP objects. With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp] sctp_outq_flush+0x306/0x2c60 [sctp] sctp_transport_immediate_rtx+0xaf/0x260 [sctp] sctp_process_asconf_ack+0xa48/0xf70 [sctp] Allocated by task 197: sctp_transport_new+0x68/0x650 [sctp] sctp_assoc_add_peer+0x258/0x12a0 [sctp] sctp_process_asconf+0x5e9/0x1090 [sctp] Last potentially related work creation: __call_rcu_common.constprop.0+0x77/0xb70 sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp] sctp_process_asconf+0xd9c/0x1090 [sctp] The first invalid access was a four-byte read of transport->state at net/sctp/outqueue.c:833. The same reproducer completed the full authenticated ASCONF and local-address replacement sequence with this change without a KASAN report or oops. Clear new_transport when its peer is removed, before it can be used to create the HEARTBEAT.
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 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf ~ c0f973bb5118dd1b146cda3fcc8af6f6057befec -
Linux Linux 3.2 -

II. Public POCs for CVE-2026-74586

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III. Intelligence Information for CVE-2026-74586

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Patches & Fixes for CVE-2026-74586 (7)

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-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
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-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
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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