net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy() skb_zerocopy() copies frags from @from into @to. On an skb_orphan_frags() failure it calls skb_tx_error(@from), a destructive operation on the source skb the copy helper does not own. That completes @from's zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, including the SKBFL_SHARED_FRAG page-ownership marker. Both callers already report the failure on their own drop path. nfnetlink_queue does it at nla_put_failure, and Open vSwitch does it in the flow-miss drop arm of ovs_dp_process_packet(), so nothing is lost by dropping it here. On Open vSwitch's OVS_ACTION_ATTR_USERSPACE path the skb is not freed on this error: do_execute_actions() ignores output_userspace()'s return value and, unless the upcall was the last action, keeps forwarding the same skb through the flow's remaining actions. The uarg is completed while that skb is still in flight, telling the producer its buffers are free, and SKBFL_SHARED_FRAG is cleared on an skb the rest of the stack still handles. That flag is what makes esp_input() call skb_cow_data() instead of decrypting in place, so a later local ESP delivery can decrypt over frags the skb does not own privately. Leave error reporting to the callers.
- Published
- Sep 16, 2026
- Updated
- Sep 28, 2026
- EPSS
- 0.2% · 8th percentile
- CWE
- —
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
37
Monitor
Low priority for now.
- CVSS
- 37 / 40 · 9.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.3
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- c5f0c0e7525443add533495e93ba8de6feab2396, 1674b4bf3eea3cac51b70778e89f8025f7cfe695, 3.14affected
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before 849bdb83123760a865bcb2970127f4c0b9423ba3affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before fb10e0e9b220a2eed08931a60dbaad9a2370c908affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before 767ec2a65cc022d303b0c9c12811e7db22057341affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before 8069643ae64dfdf634b6c78c7f622e5323031436affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before 04dd250a78e268af3e7124beb1dc10ec1dd88d60affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before a13b1e80e5015cd732440b475c0ef443dc4a2157affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before bab5a851e44a3601d31f2aa8043f385bb50ac5d9affected · git
- 36d5fe6a000790f56039afe26834265db0a3ad4c and later · before 8ece906150128d5ec2462aabcc978c568433eca4affected · git
- 3.10.51 and later · before 3.11affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | all versions | — |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.6-1 | 7.2.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 04dd250a78e268af3e7124beb1dc10ec1dd88d60 | Vendor (CNA) |
| Linux Linux | 3.11 | Vendor (CNA) |
| Linux Linux | 3.13 | Vendor (CNA) |
| Linux Linux | 767ec2a65cc022d303b0c9c12811e7db22057341 | Vendor (CNA) |
| Linux Linux | 8069643ae64dfdf634b6c78c7f622e5323031436 | Vendor (CNA) |
| Linux Linux | 849bdb83123760a865bcb2970127f4c0b9423ba3 | Vendor (CNA) |
| Linux Linux | 8ece906150128d5ec2462aabcc978c568433eca4 | Vendor (CNA) |
| Linux Linux | a13b1e80e5015cd732440b475c0ef443dc4a2157 | Vendor (CNA) |
| Linux Linux | bab5a851e44a3601d31f2aa8043f385bb50ac5d9 | Vendor (CNA) |
| Linux Linux | fb10e0e9b220a2eed08931a60dbaad9a2370c908 | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 | 6.6.157.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-1114 · Sep 17, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/04dd250a78e268af3e7124beb1dc10ec1dd88d60
- git.kernel.org/stable/c/767ec2a65cc022d303b0c9c12811e7db22057341
- git.kernel.org/stable/c/8069643ae64dfdf634b6c78c7f622e5323031436
- git.kernel.org/stable/c/849bdb83123760a865bcb2970127f4c0b9423ba3
- git.kernel.org/stable/c/8ece906150128d5ec2462aabcc978c568433eca4
- git.kernel.org/stable/c/a13b1e80e5015cd732440b475c0ef443dc4a2157
- git.kernel.org/stable/c/bab5a851e44a3601d31f2aa8043f385bb50ac5d9
- git.kernel.org/stable/c/fb10e0e9b220a2eed08931a60dbaad9a2370c908
Vendor advisories and official records. Exploit/PoC links are deliberately left out.