Vulnerability details
CVE-2026-71971
u-boot u-boot
U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
CVSS 4.0
8.8High
Official description
U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c. Remote attackers can send a crafted IP fragment with non-zero offset and More-Fragments flag set during netboot to corrupt adjacent memory and crash the bootloader.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N |
| 8.2High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| u-boot | u-boot | v < 2026.10-rc3 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9 patch
- https://github.com/u-boot/u-boot/blob/v2026.07/net/net.c#L975 technical-description
- https://github.com/u-boot/u-boot product
- https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassembly third-party-advisory
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Details
- Published
- 2026-09-30
- Last updated
- 2026-09-30
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.37%
Probability of exploitation in 30 days
31.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-787Out-of-bounds Write