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CVE-2026-99064— cipso: adjust cached option offsets when removing CIPSO

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，以下漏洞已得到修复： cipso：在移除 CIPSO 选项时，调整已缓存的选项偏移量 cipso_v4_skbuff_delattr() 函数会移除 CIPSO 字节，但并未更新紧随其后的其他选项的已缓存偏移量。 例如，若存在一个有效的 10 字节 CIPSO 选项，其后跟随一个 7 字节的 RR（记录路由）选项，解析器会记录 RR 选项位于偏移量 30 处。移除 CIPSO 后，RR 选项实际移动到了偏移量 20 处，但缓存的偏移量仍保持为 30。这导致 ip_forward_option

CVSS 8.1 · High EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 89aa3619d141d6cfb6040a561aebb6d99d3e2285< b965977126a90e01825814c859ba4788691eddd3 affected
89aa3619d141d6cfb6040a561aebb6d99d3e2285< 2200fe1d6148b78e1b8f00f4b2bd47760015077f affected
89aa3619d141d6cfb6040a561aebb6d99d3e2285< 6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0 affected
89aa3619d141d6cfb6040a561aebb6d99d3e2285< 6d25ffca055a77787c21a36b66c253f76239411b affected
6.10 affected
< 6.10 unaffected
6.12.113≤ 6.12.* unaffected
6.18.57≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-99064

Vulnerability Information
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Vulnerability Title
cipso: adjust cached option offsets when removing CIPSO
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cipso: adjust cached option offsets when removing CIPSO cipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust cached offsets for options that follow them. For example, with a valid 10-byte CIPSO option followed by a seven-byte RR option, parsing records rr at offset 30. Removing CIPSO moves RR to offset 20, while the cached offset remains 30. Consumers such as ip_forward_options() and __ip_options_echo() then access the wrong bytes; the latter may interpret packet data as the option length and copy it into fixed-size option storage. Mirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and router_alert offsets when they follow CIPSO. cipso_len is the distance the first memmove() shifts those options. The later header move and network-header reset relocate the bytes and their offset base together.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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 89aa3619d141d6cfb6040a561aebb6d99d3e2285 ~ b965977126a90e01825814c859ba4788691eddd3 -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-99064

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III. Intelligence Information for CVE-2026-99064

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Patches & Fixes for CVE-2026-99064 (2)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-99053 7.8 HIGH tipc: hold a reference to nodes found by link name
CVE-2026-98889 7.8 HIGH wifi: iwlwifi: mvm: fix sched scan IE sizing
CVE-2026-99050 7.8 HIGH gpio: mpsse: fix race when arming the IRQ poll worker
CVE-2026-98975 7.8 HIGH xfs: stop exchanging reflink flags when exchanging mappings
CVE-2026-98974 7.8 HIGH xfs: fix exchange-range-to-eof file size exchange
CVE-2026-99056 7.8 HIGH strparser: make sure __strp_recv isn't running before tearing down the parser
CVE-2026-98976 7.8 HIGH namespace: keep the lock on a mount that a propagated copy is moved beneath
CVE-2026-99054 7.8 HIGH tipc: destroy topsrv workqueues before closing connections

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-99064

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