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CVE-2026-53366— ipv4: account for fraggap on the paged allocation path

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基金会开源的一款操作系统内核。 Linux kernel 6.0之前版本存在安全漏洞，该漏洞源于在__ip_append_data()中paged分配路径未正确计算fraggap，导致线性区域大小不足，可能造成内存错误。

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1042

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 8eb77cc73977d88787b37c92831b1c242e035396< 5c6375bced6147ec2e460ee3b653f4860d5ecdc2 affected
8eb77cc73977d88787b37c92831b1c242e035396< ce494707a9c07f27c219ca67f3e138061f53d9b3 affected
8eb77cc73977d88787b37c92831b1c242e035396< a9c24eda24bd15f432e37824e6fc440977cb241c affected
8eb77cc73977d88787b37c92831b1c242e035396< 77798d7be6ef71e72fb6fc8a2901bf74ebc9706f affected
8eb77cc73977d88787b37c92831b1c242e035396< c04d9ece23deb9e26c19f9ca215e98b3295aa1bb affected
8eb77cc73977d88787b37c92831b1c242e035396< eca856950f7cb1a221e02b99d758409f2c5cec42 affected
6.0 affected
< 6.0 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-53366

Vulnerability Information
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Vulnerability Title
ipv4: account for fraggap on the paged allocation path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation path In __ip_append_data(), when the paged-allocation branch is taken, alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap, but the fraggap bytes carried over from the previous skb are copied into the new skb's linear area at offset transhdrlen by the subsequent skb_copy_and_csum_bits(). The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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基金会开源的一款操作系统内核。 Linux kernel 6.0之前版本存在安全漏洞，该漏洞源于在__ip_append_data()中paged分配路径未正确计算fraggap，导致线性区域大小不足，可能造成内存错误。
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 8eb77cc73977d88787b37c92831b1c242e035396 ~ 5c6375bced6147ec2e460ee3b653f4860d5ecdc2 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-53366

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III. Intelligence Information for CVE-2026-53366

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Patches & Fixes for CVE-2026-53366 (6)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53366

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