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CVE-2026-74666— packet: synchronize pressure clearing with ring reconfiguration

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，以下漏洞已得到修复： packet：在环配置过程中同步压力清除操作 在持有 锁的情况下更新 RX（接收）环状态，但此前在释放该锁之后，才通过 发布 tpacket 接收模式。这导致 和 可能在环已被清除后仍执行压力清除路径，而此时它们看到的仍然是 ，从而致使 解引用过时或为 NULL 的环存储区域。 为解决此问题，将现有的接收钩子赋值操作移入与环状态更新相同的 临界区中。保持该赋值操作其他方面的行为不变，包括在 TX（发送）环重新配置时也是如此，以避免引入修复所需以外的行为变更。 仅在观察到

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 2ccdbaa6d55b0656244ba57c4b56765a0af76c0a< cf8189b82bb93f219ab740e0346c919ad65ada62 affected
2ccdbaa6d55b0656244ba57c4b56765a0af76c0a< ad740b4990347521f0db260d381f9f74e7b340ba affected
2ccdbaa6d55b0656244ba57c4b56765a0af76c0a< 2c7b5eb87b2b288cdbde825f21d2b83b2f5da747 affected
2ccdbaa6d55b0656244ba57c4b56765a0af76c0a< a08196c3cc105947746ec21309edfbb60275fcdb affected
2ccdbaa6d55b0656244ba57c4b56765a0af76c0a< 1a35da325cac4d5bcad76a2aa943408a6f1d9000 affected
4.2 affected
< 4.2 unaffected
6.6.152≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74666

Vulnerability Information
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Vulnerability Title
packet: synchronize pressure clearing with ring reconfiguration
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: packet: synchronize pressure clearing with ring reconfiguration packet_set_ring() updates the RX ring state under sk_receive_queue.lock, but used to publish the tpacket receive mode through po->prot_hook.func after releasing that lock. packet_poll() and packet_recvmsg() can then run the pressure clearing path after the ring has been cleared while still seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference stale or NULL ring storage. Move the existing receive hook assignment into the same sk_receive_queue.lock section as the ring state update. Keep the assignment otherwise unchanged, including on TX ring reconfiguration, to avoid adding behavior changes that are not required for the fix. Serialize packet_recvmsg() pressure clearing with the same queue lock only after PACKET_SOCK_PRESSURE has been observed. If the flag is clear and the socket has moved away from tpacket_rcv, packet_set_ring() has already detached the socket and waited for synchronize_net(), so no new packet input can set the flag again. packet_poll() already holds sk_receive_queue.lock, so it uses the new unlocked helper directly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 2ccdbaa6d55b0656244ba57c4b56765a0af76c0a ~ cf8189b82bb93f219ab740e0346c919ad65ada62 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-74666

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III. Intelligence Information for CVE-2026-74666

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Patches & Fixes for CVE-2026-74666 (5)

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-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
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-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
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-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
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-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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

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-2026-74666

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