xsk: tighten UMEM headroom validation to account for tailroom and min frame
In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb_shared_info stored at the end of XSK frame would be corrupted. HW typically works with 128-aligned sizes so let us provide this value as bare minimum. Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.
CVE-2026-43093
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-2026-43093
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": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "5f123bc278bf4e3283d8606321bebbfd299f4384",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "1a6051cd7e3e4c54ff3854a43b638b9292af5e67",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "8769708add9eadeea8041a9761771bb715a87104",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "a03975beb9f6af0d8ac051e30b2abeabe618414f",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "0ec4d3f6e6934deb843b561ae048cd17218e5ad1",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "6523bc1b40e69301f24c14338b762af4739d6d39",
"versionType": "git"
},
{
"status": "affected",
"version": "99e3a236dd43d06c65af0a2ef9cb44306aef6e02",
"lessThan": "a315e022a72d95ef5f1d4e58e903cb492b0ad931",
"versionType": "git"
},
{
"status": "affected",
"version": "ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee",
"versionType": "git"
},
{
"status": "affected",
"version": "25c9cdef57488578da21d99eb614b97ffcf6e59f",
"versionType": "git"
},
{
"status": "affected",
"version": "98d3c852e63b49129515dd18c875999efaf8530a",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.118",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.35",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.6.7",
"lessThan": "5.7",
"versionType": "semver"
}
],
"programFiles": [
"net/xdp/xdp_umem.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xdp/xdp_umem.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43093
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40023 · Revision 1
- Added to Heist Feed
- Publisher date