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CVE-2026-74608— smb: client: Fix use-after-free in cifs_try_adding_channels()

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： smb：客户端：修复 cifs_try_adding_channels() 中的 Use-After-Free 漏洞 cifs_try_adding_channels() 函数在释放 iface_lock 之前，会先对某个接口（interface）获取一个临时引用。如果 cifs_ses_add_channel() 调用失败，该函数会释放此引用，然后增加 iface->weight_fulfilled。 在通道创建过程中，并发的接口列表刷新操作可能会移除该列表引用。在这种情

CVSS 9.8 · Critical EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cbc53148cc0946b72d62a3c53870cb22ce4ec284< 64d7584e62ac8cdc750455c5fdc6008fc2de4f06 affected
cff97d683a083b862a8bb24309e0f4d2d928128a< c292d4686f717c03e5022fc4ae7c782f39a94915 affected
6aac002bcfd554aff6d3ebb55e1660d078d70ab0< 47dfac48bce7198ad4f1a388fc8c9491f878ac3b affected
6aac002bcfd554aff6d3ebb55e1660d078d70ab0< 1ffacbadc14530e55b8d86f7b917524f6a0fb891 affected
6aac002bcfd554aff6d3ebb55e1660d078d70ab0< 1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805 affected
6aac002bcfd554aff6d3ebb55e1660d078d70ab0< 4986410316b1ae0e63c6ce418e4eb196723626e7 affected
22a6c5b3425f327e7f4c3606a72277dce82c7d83 affected
6.1.78< 6.1.183 affected
… +10 more rows
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I. Basic Information for CVE-2026-74608

Vulnerability Information
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Vulnerability Title
smb: client: Fix use-after-free in cifs_try_adding_channels()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifs_try_adding_channels() cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled. A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory. Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.
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 cbc53148cc0946b72d62a3c53870cb22ce4ec284 ~ 64d7584e62ac8cdc750455c5fdc6008fc2de4f06 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-74608

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III. Intelligence Information for CVE-2026-74608

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Patches & Fixes for CVE-2026-74608 (6)

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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
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-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
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-2026-74702 8.8 HIGH vhost-scsi: reject feature changes after endpoint

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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