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CVE-2026-74602— ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer()

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： ring-buffer: 在 rb_allocate_cpu_buffer() 中初始化 reader page order 在 rb_allocate_cpu_buffer() 函数中，遗漏了对 bpage->order 的初始化，导致其值保持为 0。当环形缓冲区（ring-buffer）的子缓冲区（subbufs）大小大于 PAGE_SIZE 时，若缓冲区被释放，free_buffer_page() 函数依赖该 order 值，从而引发问题。因此，需将该值与实际分配大小

AI Predicted 3.3 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f9b94daa542a8d2532f0930f01cd9aec2d19621b< 7c620d89bae1a926ab7d626600285d3516c9f3c4 affected
f9b94daa542a8d2532f0930f01cd9aec2d19621b< 2e37f2bf111429fbfa4d985b12df3ba496ca70aa affected
f9b94daa542a8d2532f0930f01cd9aec2d19621b< 3b3e0a6ee5bb3ac000f135beef26b2b7ed1a771a affected
f9b94daa542a8d2532f0930f01cd9aec2d19621b< 6d014e44b68ddd43f71288d2a4dbb1a259869149 affected
6.8 affected
< 6.8 unaffected
6.12.105≤ 6.12.* unaffected
6.18.45≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-74602

Vulnerability Information
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Vulnerability Title
ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0. This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if when freed: free_buffer_page() relies on this value. Align the value with the actual allocation size (buffer::subbuf_order).
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 f9b94daa542a8d2532f0930f01cd9aec2d19621b ~ 7c620d89bae1a926ab7d626600285d3516c9f3c4 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-74602

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III. Intelligence Information for CVE-2026-74602

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Patches & Fixes for CVE-2026-74602 (4)

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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
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-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
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-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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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