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CVE-2026-74689— net/atm: fix slab-out-of-bounds read in vcc_setsockopt()

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： net/atm: 修复 vcc_setsockopt() 中的 slab 越界读取问题 vcc_setsockopt() 中存在一个无效的长度检查（optlen 检查）： 如果 求值为假（例如，当调用者传递了不匹配的 level 时），长度检查 将被短路（short-circuited）并绕过。随后程序执行流入 语句，并调用 ，此时假设 包含足够的空间。 此外，即使 level 匹配，cgroup BPF 的 setsockopt 过滤器也可能在函数入口之后缩短 。由于内核

CVSS 7.1 · High EPSS 0.14% · P4

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b3bcd5d65ac03c15787b2a5b36c718e26a689336 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 35f258fee9ed358c6d0f57f91c30bf029c3724af affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6eb6af88710977eb529b558a07294874d8c40c4d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9f77c1ab382188f5b51982fab6d913443b6dc59f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2c5988c7349c0b64a7e0441bfc6e1dca54f7116a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 affected
2.6.12 affected
< 2.6.12 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74689

Vulnerability Information
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Vulnerability Title
net/atm: fix slab-out-of-bounds read in vcc_setsockopt()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/atm: fix slab-out-of-bounds read in vcc_setsockopt() vcc_setsockopt() contained an ineffective optlen check: if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) return -EINVAL; If __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller passed a mismatched level), the length check optlen != __SO_SIZE(optname) was short-circuited and bypassed. Execution then fell through to switch(optname), calling copy_from_sockptr() assuming optval contained sufficient space. Furthermore, even if level matched, a cgroup BPF setsockopt filter could shrink optlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(), this leads to a KASAN slab-out-of-bounds read when optlen is smaller than the expected structure size. Fix this by using copy_safe_from_sockptr(), which unconditionally validates that optlen is at least the expected size before copying. Also change the local 'value' variable type from 'unsigned long' to 'int' so that SO_SETCLP matches its sizeof(int) ABI encoding on 64-bit systems.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ b3bcd5d65ac03c15787b2a5b36c718e26a689336 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-74689

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III. Intelligence Information for CVE-2026-74689

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Patches & Fixes for CVE-2026-74689 (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-2026-74616 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-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
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-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
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-2026-74689

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