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

AI Predicted 7.5 Difficulty: Moderate EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 89343ff12b3178fc236fe531a3603e7c97c68278affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8ff85dbabbbfb05e86e6cde31d91ac5782179d4daffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 00e8845fe3428c69e980dce5071cb3da1d8f7578affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a4f3fd6516920988c47ba8d19714985c40c816a1affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 28f5ad1b4055405eb1616e603fe511ba5e3725e7affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7caffected
… +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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 -
LinuxLinux 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 (7)

Same Patch Batch · Linux · 2026-06-25 · 147 CVEs total

CVE-2026-531759.8 CRITICALinet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-531769.8 CRITICALIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-532219.8 CRITICALip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-532169.8 CRITICALnet: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-532289.8 CRITICALipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-531519.8 CRITICALrxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-532159.8 CRITICALnet: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-532609.8 CRITICALtcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-532479.8 CRITICALnet: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-532469.8 CRITICALsctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-531319.4 CRITICALnetfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-532249.1 CRITICALsctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-531869.1 CRITICALRDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-532259.1 CRITICALsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-532008.8 HIGHKVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-532778.8 HIGHKVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
CVE-2026-532328.8 HIGHnet: phy: clean the sfp upstream if phy probing fails
CVE-2026-531988.8 HIGHksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-532408.8 HIGHxfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-531888.8 HIGHRDMA/core: Validate the passed in fops for ib_get_ucaps()

Showing top 20 of 147 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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