net: skbuff: preserve shared-frag marker during coalescing
Summary
| CVE | CVE-2026-46300 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-23 12:17:02 UTC |
| Updated | 2026-05-30 11:17:28 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Problem Types: CWE-787
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 3599e6b3cc1ada96883d496a50a210d3afbb6987 git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 78bf6b6bb19541d19fbda6242e7cfe2c682763c0 git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 3bd9e113d50034db99d7ef69fd8e5242d15e414a git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 3884358a9286b17f389a72b1426fc4547c23c111 git | Not specified |
| CNA | Linux | Linux | affected cef401de7be8c4e155c6746bfccf721a4fa5fab9 f84eca5817390257cef78013d0112481c503b4a3 git | Not specified |
| CNA | Linux | Linux | affected 3.9 | Not specified |
| CNA | Linux | Linux | unaffected 3.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.257 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.208 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.174 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.141 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.91 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.33 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.10 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1-rc5 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| www.openwall.com/lists/oss-security/2026/05/13/5 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List |
| git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| www.openwall.com/lists/oss-security/2026/05/21/11 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List |
| www.openwall.com/lists/oss-security/2026/05/21/12 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List |
| git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| www.openwall.com/lists/oss-security/2026/05/21/13 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List |
| git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.