FKIE_CVE-2026-46300
Vulnerability from fkie_nvd - Published: 2026-05-23 12:17 - Updated: 2026-06-30 03:20
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: preserve shared-frag marker during coalescing
skb_try_coalesce() can attach paged frags from @from to @to. If @from
has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same
externally-owned or page-cache-backed frags, but the shared-frag marker
is currently lost.
That breaks the invariant relied on by later in-place writers. In
particular, ESP input checks skb_has_shared_frag() before deciding
whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP
receive coalescing has moved shared frags into an unmarked skb, ESP can
see skb_has_shared_frag() as false and decrypt in place over page-cache
backed frags.
Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged
frags. The tailroom copy path does not need the marker because it copies
bytes into @to's linear data rather than transferring frag descriptors.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 7.1 | |
| linux | linux_kernel | 7.1 | |
| linux | linux_kernel | 7.1 | |
| linux | linux_kernel | 7.1 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/skbuff.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3599e6b3cc1ada96883d496a50a210d3afbb6987",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "9d3e5fd19fe1063bf607219e8562fbd567b8e8d5",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "78bf6b6bb19541d19fbda6242e7cfe2c682763c0",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "3bd9e113d50034db99d7ef69fd8e5242d15e414a",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "f84eca5817390257cef78013d0112481c503b4a3",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/skbuff.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.9"
},
{
"lessThan": "3.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.257",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.208",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.174",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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],
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"vendor": "Red Hat"
},
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],
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"product": "Red Hat OpenShift Container Platform 4.21",
"vendor": "Red Hat"
},
{
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{
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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},
{
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],
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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},
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},
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},
{
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],
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"product": "Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)",
"vendor": "Red Hat"
},
{
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],
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},
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},
{
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],
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},
{
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},
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},
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],
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},
{
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],
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},
{
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],
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},
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"cpe:/o:redhat:enterprise_linux:10.2"
],
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},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
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{
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},
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},
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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],
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},
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},
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],
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},
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},
{
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},
{
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],
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}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
}
],
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to. If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers. In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data(). If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags. The tailroom copy path does not need the marker because it copies\nbytes into @to\u0027s linear data rather than transferring frag descriptors."
}
],
"id": "CVE-2026-46300",
"lastModified": "2026-06-30T03:20:19.317",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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