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CVE-2026-53223— net: guard timestamp cmsgs to real error queue skbs

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于timestamp cmsg路径中错误地将AF_PACKET套接字的PACKET_OUTGOING skb视为错误队列skb，可能导致读取AF_PACKET控制缓冲区状态作为sock_exterr_skb::opt_stats，在启用SO_RXQ_OVFL时触发SCM_TIMESTAMPING_OPT_STATS，进而造成敏感堆内容泄露或触发强化用户复制检查。

CVSS 7.1 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 8605330aac5a5785630aec8f64378a54891937cc< 24a0d548d3a765cd4558224e4f8e06e14cba26e3 affected
8605330aac5a5785630aec8f64378a54891937cc< 71ff5cdd5da61d0438e902aa0fd68c28bc901abe affected
8605330aac5a5785630aec8f64378a54891937cc< ad9a0374ee6d11048e1f74cd5180bad58b9848b4 affected
8605330aac5a5785630aec8f64378a54891937cc< b903e9b5629ec8dd6db92174070045bf81ad7060 affected
8605330aac5a5785630aec8f64378a54891937cc< e0665b2a8e90bb08bd205062c75662b502d31797 affected
8605330aac5a5785630aec8f64378a54891937cc< 3dde4fb941fa5649ab809f6cd3e20e0c424a4e31 affected
8605330aac5a5785630aec8f64378a54891937cc< eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a affected
8605330aac5a5785630aec8f64378a54891937cc< 1ee90b77b727df903033db873c75caac5c27ec98 affected
… +12 more rows
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I. Basic Information for CVE-2026-53223

Vulnerability Information
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Vulnerability Title
net: guard timestamp cmsgs to real error queue skbs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于timestamp cmsg路径中错误地将AF_PACKET套接字的PACKET_OUTGOING skb视为错误队列skb，可能导致读取AF_PACKET控制缓冲区状态作为sock_exterr_skb::opt_stats，在启用SO_RXQ_OVFL时触发SCM_TIMESTAMPING_OPT_STATS，进而造成敏感堆内容泄露或触发强化用户复制检查。
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 8605330aac5a5785630aec8f64378a54891937cc ~ 24a0d548d3a765cd4558224e4f8e06e14cba26e3 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-53223

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III. Intelligence Information for CVE-2026-53223

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Patches & Fixes for CVE-2026-53223 (8)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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