CVE-2026-68297High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: tipc: fix u16 MTU truncation in media and bearer MTU validation Both TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept user-supplied MTU values but only enforce a minimu…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
tipc: fix u16 MTU truncation in media and bearer MTU validation
Both TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept user-supplied MTU values but only enforce a minimum bound, not a maximum. When a user sets the MTU to a value exceeding U16_MAX (65535), it passes validation but is silently truncated when assigned to u16 fields l->mtu and l->advertised_mtu in tipc_link_create(). Values like 65536 (0x10000) truncate to 0, causing a division by zero in tipc_link_set_queue_limits() which computes TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE). Other overflowing values (e.g. 65537-131071) produce small incorrect MTU values, resulting in link malfunction behaviors.
Crash stack (triggered as unprivileged user via user namespace):
tipc_link_set_queue_limits net/tipc/link.c:2531 tipc_link_create net/tipc/link.c:520 tipc_node_check_dest net/tipc/node.c:1279 tipc_disc_rcv net/tipc/discover.c:252 tipc_rcv net/tipc/node.c:2129 tipc_udp_recv net/tipc/udp_media.c:392
Two independent paths lack the upper bound check:
Fix both by rejecting MTU values above U16_MAX.
Linux >= 901271e0403af638c224987c2a4e55cebade7e91 < 8bfdfe0dbb36a650b7c4dec1aeae078319938a0bLinux >= 901271e0403af638c224987c2a4e55cebade7e91 < dc4b577a083b361d25e118dc96d8281255ebe22cLinux >= 901271e0403af638c224987c2a4e55cebade7e91 < dfdfd987f1917c84766e097a6120a1f3f1634940Linux >= 901271e0403af638c224987c2a4e55cebade7e91 < f02334a9e378f7e07232b26dc3d2ab353339f040Linux >= 901271e0403af638c224987c2a4e55cebade7e91 < f4013598b69457dbea350df52e52daea6faef8ebLinux >= 901271e0403af638c224987c2a4e55cebade7e91 < 1b8fb5a20508bfb0db854e01214888c761b3a911Linux >= 901271e0403af638c224987c2a4e55cebade7e91 < c1cda72f6acec02ebd45d913bf8527ff77336ba6Linux >= 901271e0403af638c224987c2a4e55cebade7e91 < 9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8Linux 4.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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