ipv4: account for fraggap on the paged allocation path
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.
CVE-2026-53366
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53366
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8eb77cc73977d88787b37c92831b1c242e035396",
"lessThan": "5c6375bced6147ec2e460ee3b653f4860d5ecdc2",
"versionType": "git"
},
{
"status": "affected",
"version": "8eb77cc73977d88787b37c92831b1c242e035396",
"lessThan": "ce494707a9c07f27c219ca67f3e138061f53d9b3",
"versionType": "git"
},
{
"status": "affected",
"version": "8eb77cc73977d88787b37c92831b1c242e035396",
"lessThan": "a9c24eda24bd15f432e37824e6fc440977cb241c",
"versionType": "git"
},
{
"status": "affected",
"version": "8eb77cc73977d88787b37c92831b1c242e035396",
"lessThan": "77798d7be6ef71e72fb6fc8a2901bf74ebc9706f",
"versionType": "git"
},
{
"status": "affected",
"version": "8eb77cc73977d88787b37c92831b1c242e035396",
"lessThan": "c04d9ece23deb9e26c19f9ca215e98b3295aa1bb",
"versionType": "git"
},
{
"status": "affected",
"version": "8eb77cc73977d88787b37c92831b1c242e035396",
"lessThan": "eca856950f7cb1a221e02b99d758409f2c5cec42",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/ip_output.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.38",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.3",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/ip_output.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53366
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40813 · Revision 1
- Added to Heist Feed
- Publisher date