cve-2026-46300
HIGH CVSS 7.8 nvd
Description
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.
Timeline
- Published
- 2026-05-23
- Last Modified
- 2026-09-08
CVSS Details
- Attack Vector
- LOCAL
- Attack Complexity
- LOW
- Privileges Required
- LOW
Affected Products
- linux linux_kernel
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
| 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8 | 5.9 | nvd@nist.gov |
| 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 3.9, <= 5.10.257 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.11, < 5.15.208 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.16, < 6.1.174 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.2, < 6.6.141 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.7, < 6.12.91 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.13, < 6.18.33 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.19, < 7.0.10 | yes |
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* |
— | yes |
NVD metadata
- NVD status
- Modified
- Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c Patch
- https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 Patch
- https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 Patch
- https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a Patch
- https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e Patch
- https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 Patch
- https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 Patch
- https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 Patch
- http://www.openwall.com/lists/oss-security/2026/05/13/5 Mailing List
- http://www.openwall.com/lists/oss-security/2026/05/21/11 Mailing List
- http://www.openwall.com/lists/oss-security/2026/05/21/12 Mailing List
- http://www.openwall.com/lists/oss-security/2026/05/21/13 Mailing List
- https://access.redhat.com/errata/RHBA-2026:20032
- https://access.redhat.com/errata/RHSA-2026:19521
- https://access.redhat.com/errata/RHSA-2026:19540
- https://access.redhat.com/errata/RHSA-2026:19568
- https://access.redhat.com/errata/RHSA-2026:19569
- https://access.redhat.com/errata/RHSA-2026:19664
- https://access.redhat.com/errata/RHSA-2026:19666
- https://access.redhat.com/errata/RHSA-2026:19705
- https://access.redhat.com/errata/RHSA-2026:19711
- https://access.redhat.com/errata/RHSA-2026:19875
- https://access.redhat.com/errata/RHSA-2026:20051
- https://access.redhat.com/errata/RHSA-2026:20054
- https://access.redhat.com/errata/RHSA-2026:20087
- https://access.redhat.com/errata/RHSA-2026:20129
- https://access.redhat.com/errata/RHSA-2026:20130
- https://access.redhat.com/errata/RHSA-2026:20299
- https://access.redhat.com/errata/RHSA-2026:20593
- https://access.redhat.com/errata/RHSA-2026:21656
- https://access.redhat.com/errata/RHSA-2026:21690
- https://access.redhat.com/errata/RHSA-2026:21695
- https://access.redhat.com/errata/RHSA-2026:21702
- https://access.redhat.com/errata/RHSA-2026:23233
- https://access.redhat.com/errata/RHSA-2026:23240
- https://access.redhat.com/errata/RHSA-2026:23245
- https://access.redhat.com/errata/RHSA-2026:23468
- https://access.redhat.com/errata/RHSA-2026:23469
- https://access.redhat.com/errata/RHSA-2026:23470
- https://access.redhat.com/errata/RHSA-2026:23471
- https://access.redhat.com/errata/RHSA-2026:24814
- https://access.redhat.com/errata/RHSA-2026:25044
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/errata/RHSA-2026:34098
- https://access.redhat.com/security/cve/CVE-2026-46300
- https://bugzilla.redhat.com/show_bug.cgi?id=2477015
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json
Linked Vulnerabilities
{
"cvss": 7.8,
"datePublished": "2026-05-23T12:17:02.660",
"dateUpdated": "2026-09-08T09:18:09.057",
"description": "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's linear data rather than transferring frag descriptors.",
"id": "CVE-2026-46300",
"raw": {
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"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's linear data rather than transferring frag descriptors."
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"title": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during ..."
}