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CVE-2019-11478— SACK can cause extensive memory use via fragmented resend queue

Quick assessment

Affected
Linux Linux kernel
Exploitation
High exploitation probability; assess promptly
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基金会的开源操作系统Linux所使用的内核。 Linux kernel中网络子系统处理TCP Selective Acknowledgment片段的方法存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。攻击者可利用该漏洞造成拒绝服务（消耗大量资源）。

AI Predicted 7.5 Difficulty: Moderate EPSS 94.69% · P100

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2019-11478

Vulnerability Information
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Vulnerability Title
SACK can cause extensive memory use via fragmented resend queue
Source: CVE Program / CVE List V5
Vulnerability Description
Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit f070ef2ac66716357066b683fb0baf55f8191a2e.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel中网络子系统处理TCP Selective Acknowledgment片段的方法存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。攻击者可利用该漏洞造成拒绝服务（消耗大量资源）。
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 kernel 4.4 ~ 4.4.182 -

II. Public POCs for CVE-2019-11478

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III. Intelligence Information for CVE-2019-11478

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Patches & Fixes for CVE-2019-11478 (1)

Vendor Advisories for CVE-2019-11478 (11)

Exploits & Public PoCs for CVE-2019-11478 (1)

Mailing List Discussions for CVE-2019-11478 (6)

Other References for CVE-2019-11478 (7)

Same Patch Batch · Linux · 2019-06-18 · 3 CVEs total

CVE-2019-11477 Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs
CVE-2019-11479 Linux kernel 资源管理错误漏洞

IV. Related Vulnerabilities

Same product: Linux kernel
Same vendor: Linux
Same weakness: CWE-770

V. Comments for CVE-2019-11478

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