CVE-2026-126957
- Source
- https://cve.org/CVERecord?id=CVE-2026-126957
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126957.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-126957
- Aliases
-
- GHSA-cvv6-5f6x-87qf
- Published
- 2026-11-12T02:23:44Z
- Modified
- 2026-11-12T10:45:32Z
- Severity
-
- 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- ICMPv4 Record Route / Timestamp option: stack OOB read via ptr underflow in icmpv4.c
- Details
-
An integer underflow in Zephyr's IPv4 option handling allows a remote, unauthenticated attacker to read stack memory. When replying to an ICMP Echo Request that carries an IPv4 Record Route or Timestamp option, icmpv4_update_record_route() and icmpv4_update_time_stamp() in subsys/net/ip/icmpv4.c compute the length of the already recorded data as ptr - ptr_offset in uint8_t arithmetic. The attacker-controlled Pointer field is checked against the option length but not against the RFC 791 minimum (4 for Record Route, 5 for Timestamp), so a smaller value wraps the length to up to 252 bytes. net_pkt_write() then reads past the 40-byte opt_data stack buffer and up to 213 bytes of stack memory, which can include stack and heap pointers, are returned in the ICMP Echo Reply. A single packet triggers the leak and the device does not crash, so it can be repeated. Devices built with CONFIG_NET_IPV4_HDR_OPTIONS, which CONFIG_NET_IPV4_IGMP selects, are affected.
- Database specific
{ "cna_assigner": "zephyr", "cwe_ids": [ "CWE-125", "CWE-191", "CWE-200" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126957.json" }- References
Affected packages
Git / github.com/zephyrproject-rtos/zephyr
Affected ranges
- Type
- GIT
- Repo
- https://github.com/zephyrproject-rtos/zephyr
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast Affected
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "*" }, { "last_affected": "4.4.0" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" } ] }