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CVE-2026-74626— NTB: ntb_netdev: Preserve RX queue depth on allocation failure

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 存在安全漏洞，该漏洞源于ntb_netdev_rx_handler()函数在处理数据包时，先将接收到的skb交给网络栈，分配失败时未重新发布缓冲区，导致RX队列深度逐渐减少，最终造成接收停滞，可能引发拒绝服务。

CVSS 7.5 · High EPSS 0.50% · P42

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 548c237c0a9972df5d1afaca38aa733ee577128d< 6d7f8a23c130d768c0976c2578b214353674e18f affected
548c237c0a9972df5d1afaca38aa733ee577128d< 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5 affected
548c237c0a9972df5d1afaca38aa733ee577128d< 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4 affected
548c237c0a9972df5d1afaca38aa733ee577128d< fcaf8ba7e56bb73319ac107a63b907d59536192c affected
548c237c0a9972df5d1afaca38aa733ee577128d< 3f2a15f33f86f7bd5b920669fd40c06725d72a1e affected
548c237c0a9972df5d1afaca38aa733ee577128d< a4e340971fe8ccd245d206db4d43b2a0eec240bd affected
548c237c0a9972df5d1afaca38aa733ee577128d< 755fd7843f300d724caceabdf9bb13adc8701540 affected
548c237c0a9972df5d1afaca38aa733ee577128d< d2121faf133ac3bf9531b53a7e21273649a08517 affected
… +10 more rows
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I. Basic Information for CVE-2026-74626

Vulnerability Information
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Vulnerability Title
NTB: ntb_netdev: Preserve RX queue depth on allocation failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_netdev: Preserve RX queue depth on allocation failure ntb_netdev_rx_handler() hands the received skb to the network stack before allocating its replacement. If the allocation fails, nothing is reposted. Every failure therefore takes one buffer out of the RX queue while the interface remains up, and enough failures eventually stall reception. A retry path could refill the queue later, but ntb_netdev has none. Allocate the replacement first instead. If that fails, drop the packet and repost the same skb. This keeps the queue full and lets packet delivery resume as soon as memory is available again.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 存在安全漏洞，该漏洞源于ntb_netdev_rx_handler()函数在处理数据包时，先将接收到的skb交给网络栈，分配失败时未重新发布缓冲区，导致RX队列深度逐渐减少，最终造成接收停滞，可能引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 548c237c0a9972df5d1afaca38aa733ee577128d ~ 6d7f8a23c130d768c0976c2578b214353674e18f -
Linux Linux 3.9 -

II. Public POCs for CVE-2026-74626

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III. Intelligence Information for CVE-2026-74626

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Patches & Fixes for CVE-2026-74626 (2)

Other References for CVE-2026-74626 (5)

Same Patch Batch · Linux · 2026-08-22 · 149 CVEs total

CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
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-2026-74616 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-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
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-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
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 149 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74626

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