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CVE-2026-74646— misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

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： misc: fastrpc: 在处理中断的 invoke 操作期间移动 mmaps 时获取 fl->lock 当 invoke 操作因信号而被中断时， 返回 ，并且 会将 上的所有缓冲区移动到 。该 / 遍历操作在未持有 的情况下执行，而 是在其他所有地方对 进行序列化访问（如在 和 中）所必需的锁。 因此，在移动操作期间获取 ，以与其他所有访问 的地方保持一致。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc< 3f265e405e5ef85030c3777262e18bb556bc8724 affected
76e8e4ace1ed2c97dba3b1370e0e105e07c572bc< a902fe1f80f58a2335b6be1131866f827ec44d1a affected
76e8e4ace1ed2c97dba3b1370e0e105e07c572bc< af6345159abcbaa550518f31990d2a9558c2d369 affected
76e8e4ace1ed2c97dba3b1370e0e105e07c572bc< efd02f8d1a7449f15809bc18d3cd41aafea75d7e affected
76e8e4ace1ed2c97dba3b1370e0e105e07c572bc< b85a0e91d7d6cd06a53c881a46f749cfcef416a2 affected
6.2 affected
< 6.2 unaffected
6.6.152≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74646

Vulnerability Information
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Vulnerability Title
misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor.
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 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc ~ 3f265e405e5ef85030c3777262e18bb556bc8724 -
Linux Linux 6.2 -

II. Public POCs for CVE-2026-74646

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III. Intelligence Information for CVE-2026-74646

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Patches & Fixes for CVE-2026-74646 (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-2026-74587 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-2026-74688 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-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
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-2026-74662 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-2026-74727 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-2026-74723 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-2026-74611 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

V. Comments for CVE-2026-74646

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