DEBIAN-CVE-2026-29008
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-29008
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29008.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-29008
- Upstream
- Published
- 2026-07-08T17:17:21Z
- Modified
- 2026-09-14T17:03:03Z
- Severity
-
- 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
- Summary
- [none]
- Details
-
U-Boot through 2026.04-rc3 contains an integer underflow vulnerability in the tcp_rx_state_machine() function (net/tcp.c) that allows a network-adjacent attacker to crash the bootloader by sending a malformed TCP SYN+ACK packet with a manipulated data offset field causing payload_len to become negative. When the TCP_SYN_SENT handler calls tcp_rx_user_data() without invoking tcp_seg_in_wnd() validation, the negative payload_len is implicitly converted to a large unsigned integer (e.g., 0xFFFFFFD8) and passed to memcpy() in store_block(), causing an immediate crash that prevents device boot and may enable memory corruption when CONFIG_LMB is disabled.
- References
Affected packages
Debian:12 / u-boot
Package
- Name
- u-boot
- Purl
- pkg:deb/debian/u-boot?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
2023.*
2023.01+dfsg-2
2023.01+dfsg-2+deb12u1
2023.01+dfsg-2+deb12u2
2023.01+dfsg-2+deb12u3
2023.04~rc2+dfsg-1
2023.04~rc5+dfsg-1
2023.04+dfsg-1
2023.07~rc4+dfsg-1
2023.07~rc5+dfsg-1
2023.07+dfsg-1
2024.*
2024.01~rc6+dfsg-1
2024.01~rc6+dfsg-2
2024.01+dfsg-1
2024.01+dfsg-2
2024.01+dfsg-3
2024.01+dfsg-4
2024.01+dfsg-5
2024.01+dfsg-6
2024.01+dfsg-7
2025.*
2025.01-1
2025.01-2
2025.01-3
2025.01-3.1
2025.01-3.2
Debian:13 / u-boot
Package
- Name
- u-boot
- Purl
- pkg:deb/debian/u-boot?arch=source&distro=trixie
Debian:14 / u-boot
Package
- Name
- u-boot
- Purl
- pkg:deb/debian/u-boot?arch=source&distro=forky