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CVE-2019-11479

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 存在资源管理错误漏洞，该漏洞源于默认 MSS 被硬编码为 48 字节。

AI Predicted 7.5 Difficulty: Moderate EPSS 91.66% · P100

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2019-11479

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. 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 commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
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 存在资源管理错误漏洞，该漏洞源于默认 MSS 被硬编码为 48 字节。
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-2019-11479

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III. Intelligence Information for CVE-2019-11479

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Patches & Fixes for CVE-2019-11479 (2)

Vendor Advisories for CVE-2019-11479 (14)

Mailing List Discussions for CVE-2019-11479 (3)

Other References for CVE-2019-11479 (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-2019-11478 SACK can cause extensive memory use via fragmented resend queue

IV. Related Vulnerabilities

Same product: Linux kernel
Same vendor: Linux
Same weakness: CWE-405

V. Comments for CVE-2019-11479

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