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Review reviewHigh

CVE-2026-53366

Linux Linux, linux kernel

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...

CVSS
7.8
EPSS
0.17%
6.75% percentile
CISA KEV
Not listed
Published
2026.07.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.17%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 8eb77cc73977d88787b37c92831b1c242e035396 < 5c6375bced6147ec2e460ee3b653f4860d5ecdc2, >= 8eb77cc73977d88787b37c92831b1c242e035396 < ce494707a9c07f27c219ca67f3e138061f53d9b3, >= 8eb77cc73977d88787b37c92831b1c242e035396 < a9c24eda24bd15f432e37824e6fc440977cb241c, >= 8eb77cc73977d88787b37c92831b1c242e035396 < 77798d7be6ef71e72fb6fc8a2901bf74ebc9706f, >= 8eb77cc73977d88787b37c92831b1c242e035396 < c04d9ece23deb9e26c19f9ca215e98b3295aa1bb, >= 8eb77cc73977d88787b37c92831b1c242e035396 < eca856950f7cb1a221e02b99d758409f2c5cec42, >= 6.0, >= 6.0 < 6.6.144, >= 6.7 < 6.12.95, >= 6.13 < 6.18.38, >= 6.19 < 7.1.3
Fixed versions
6.6.144, 6.12.95, 6.18.38, 7.1.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available