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CVE-2026-53249— ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

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，该漏洞源于限制IPOPT_SSRR和IPOPT_LSRR选项，可能导致非特权应用通过攻击者控制的节点路由数据包泄露TCP ISN和其他协议信息。以下版本受到影响：2.6.12版本。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 89343ff12b3178fc236fe531a3603e7c97c68278 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8ff85dbabbbfb05e86e6cde31d91ac5782179d4d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 00e8845fe3428c69e980dce5071cb3da1d8f7578 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a4f3fd6516920988c47ba8d19714985c40c816a1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 28f5ad1b4055405eb1616e603fe511ba5e3725e7 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c affected
… +10 more rows
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I. Basic Information for CVE-2026-53249

Vulnerability Information
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Vulnerability Title
ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAP_NET_RAW capability. This prevents unprivileged applications from forcing packets to route through attacker-controlled nodes to leak TCP ISN and possibly other protocol information. While LSRR and SSRR are commonly filtered in many network environments, they may still be supported and forwarded along some network paths. RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing IPv4 Options) recommend to drop these options in 4.3 and 4.4.
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
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，该漏洞源于限制IPOPT_SSRR和IPOPT_LSRR选项，可能导致非特权应用通过攻击者控制的节点路由数据包泄露TCP ISN和其他协议信息。以下版本受到影响：2.6.12版本。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-53249

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III. Intelligence Information for CVE-2026-53249

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Patches & Fixes for CVE-2026-53249 (6)

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-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
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-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
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-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53249

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