CVE-2025-21926: net: gso: fix ownership in __udp_gso_segment
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 01a83237644d6822bc7df2c5564fc81b0df84358, 084819b0d8b1bd433b90142371eb9450d657f8ca, 455217ac9db0cf9349b3933664355e907bb1a569.
- Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
Low priority for now. Upgrade to Linux Linux 01a83237644d6822bc7df2c5564fc81b0df84358, 084819b0d8b1bd433b90142371eb9450d657f8ca, 455217ac9db0cf9349b3933664355e907bb1a569 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: net: gso: fix ownership in __udp_gso_segment In __udp_gso_segment the skb destructor is removed before segmenting the skb but the socket reference is kept as-is. This is an issue if the original skb is later orphaned as we can hit the following bug: kernel BUG at ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0 Call Trace: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100 __napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50 The above can happen following a sequence of events when using OpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an OVS_ACTION_ATTR_OUTPUT action: 1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb goes through queue_gso_packets and then __udp_gso_segment, where its destructor is removed. 2. The segments' data are copied and sent to userspace. 3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the same original skb is sent to its path. 4. If it later hits skb_orphan, we hit the bug. Fix this by also removing the reference to the socket in __udp_gso_segment.
- Published
- Apr 1, 2025
- Updated
- Nov 10, 2026
- EPSS
- 0.2% · 15th percentile
- CWE
- —
Report tools
Action score
22
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 7.8
- 2.3 point gap
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
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
- 4.18affected
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before 9f28205ddb76e86cac418332e952241d85fed0dcaffected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before a2d1cca955ed34873e524cc2e6e885450d262f05affected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before 455217ac9db0cf9349b3933664355e907bb1a569affected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before e8db70537878e1bb3fd83e5abcc6feefc0587828affected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before 01a83237644d6822bc7df2c5564fc81b0df84358affected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before 084819b0d8b1bd433b90142371eb9450d657f8caaffected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11baffected · git
- ad405857b174ed31a97982bb129c320d03321cf5 and later · before ee01b2f2d7d0010787c2343463965bbc283a497faffected · git
- before 4.18not affected · semver
Affected versions · NVD (8)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel4.18 and later · before 5.4.291
- linux linux kernel5.5 and later · before 5.10.235
- linux linux kernel5.11 and later · before 5.15.179
- linux linux kernel5.16 and later · before 6.1.131
- linux linux kernel6.2 and later · before 6.6.83
- linux linux kernel6.7 and later · before 6.12.19
- linux linux kernel6.13 and later · before 6.13.7
- linux linux kernel6.14
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:9 | kernel | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug-devel | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug-devel-matched | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug-modules | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug-modules-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-debug-modules-extra | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-devel | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-devel-matched | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-modules | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-modules-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-64k-modules-extra | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-abi-stablelists | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-cross-headers | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-debug | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-debug-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-debug-devel | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-debug-devel-matched | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-debug-modules | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
| AlmaLinux:9 | kernel-debug-modules-core | before 5.14.0-570.21.1.el9_6 | 5.14.0-570.21.1.el9_6 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2025-21924Apr 1, 2025 · net: hns3: make sure ptp clock is unregister and freed if hclge_ptp_get_cycle returns an error22Monitor
- ← EarlierCVE-2025-21925Apr 1, 2025 · llc: do not use skb_get() before dev_queue_xmit()22Monitor
- Later →CVE-2025-21927Apr 1, 2025 · nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu()31Monitor
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 | 01a83237644d6822bc7df2c5564fc81b0df84358 | Vendor (CNA) |
| Linux Linux | 084819b0d8b1bd433b90142371eb9450d657f8ca | Vendor (CNA) |
| Linux Linux | 455217ac9db0cf9349b3933664355e907bb1a569 | Vendor (CNA) |
| Linux Linux | 9f28205ddb76e86cac418332e952241d85fed0dc | Vendor (CNA) |
| Linux Linux | a2d1cca955ed34873e524cc2e6e885450d262f05 | Vendor (CNA) |
| Linux Linux | c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b | Vendor (CNA) |
| Linux Linux | e8db70537878e1bb3fd83e5abcc6feefc0587828 | Vendor (CNA) |
| Linux Linux | ee01b2f2d7d0010787c2343463965bbc283a497f | Vendor (CNA) |
| almalinux:kernel | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-570.21.1.el9_6 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.133-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel-matched | 0:5.14.0-570.21.1.el9_6 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
+4
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.
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
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 (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca
- git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569
- git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc
- git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05
- git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b
- git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828
- git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497f
- lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.