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CVE-2026-74709— xsk: clear metadata pointer when no timestamp is requested

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，以下漏洞已得到解决： xsk：在未请求时间戳时清除元数据指针 用户空间可以在请求处理后修改元数据标志。因此在完成阶段重新读取这些标志时，内核可能会在提交数据包时未被请求的情况下写入时间戳。 除非请求了时间戳完成处理，否则在请求处理阶段应清除元数据指针。这样，完成处理就可以直接使用指针本身，而无需重新读取标志。 在 mlx5 多包 WQE（Work Queue Element，工作队列元素）路径中，元数据是按批次评估的： 仅针对开启会话的描述符运行，这与通过共享 WQE 一次性应用的校验和卸载

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P11

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux ca4419f15abd19ba8be1e109661b60f9f5b6c9f0< 0ba2e1eb07a826d021344e2f146b6716c58139eb affected
ca4419f15abd19ba8be1e109661b60f9f5b6c9f0< eb4c613d4ebc3f664e70d572b8867ba114a8754e affected
ca4419f15abd19ba8be1e109661b60f9f5b6c9f0< 9f60a67df8d3c862503bee62bada8e7089cba438 affected
d9d736c416c9a85f84e15435ba82a177262e745b affected
6.14.2< 6.15 affected
6.15 affected
< 6.15 unaffected
6.18.45≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-74709

Vulnerability Information
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Vulnerability Title
xsk: clear metadata pointer when no timestamp is requested
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xsk: clear metadata pointer when no timestamp is requested User space can change metadata flags after request processing. Rereading them during completion can therefore make the kernel write a timestamp that was not requested when the packet was submitted. Clear the metadata pointer during request processing unless timestamp completion is requested. Completion handling can then use the pointer itself instead of rereading the flags. On the mlx5 multi-packet WQE path metadata is evaluated per batch: xsk_tx_metadata_request() runs only for the descriptor that starts a session, just like the checksum offload that is applied once through the shared WQE. Only that descriptor's pointer is reset, so completion handling can record a timestamp for the other descriptors of the session regardless of their own XDP_TXMD_FLAGS_TIMESTAMP bit. The write stays inside the metadata area; the single-WQE, other zero-copy, and generic paths reset the pointer per descriptor and are unaffected.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 ~ 0ba2e1eb07a826d021344e2f146b6716c58139eb -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-74709

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III. Intelligence Information for CVE-2026-74709

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Patches & Fixes for CVE-2026-74709 (3)

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-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
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-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
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-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
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-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
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-2026-74712 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

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