Answer in brief
CVE-2026-68297 records a High severity (CVSS 7.8) vulnerability in tipc: fix u16 MTU truncation in media and bearer MTU validation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=901271e0403af638c224987c2a4e55cebade7e91 <f02334a9e378f7e07232b26dc3d2ab353339f040 || >=901271e0403af638c224987c2a4e55cebade7e91 <f4013598b69457dbea350df52e52daea6faef8eb || >=901271e0403af638c224987c2a4e55cebade7e91 <1b8fb5a20508bfb0db854e01214888c761b3a911 || >=901271e0403af638c224987c2a4e55cebade7e91 <c1cda72f6acec02ebd45d913bf8527ff77336ba6 || >=901271e0403af638c224987c2a4e55cebade7e91 <9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8 | f02334a9e378f7e07232b26dc3d2ab353339f040, f4013598b69457dbea350df52e52daea6faef8eb, 1b8fb5a20508bfb0db854e01214888c761b3a911, c1cda72f6acec02ebd45d913bf8527ff77336ba6, 9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8 |
| Linux/Linuxgeneric | 4.18 | Not reported |
| Linux/Linuxgeneric | >=901271e0403af638c224987c2a4e55cebade7e91 <8bfdfe0dbb36a650b7c4dec1aeae078319938a0b || >=901271e0403af638c224987c2a4e55cebade7e91 <dc4b577a083b361d25e118dc96d8281255ebe22c || >=901271e0403af638c224987c2a4e55cebade7e91 <dfdfd987f1917c84766e097a6120a1f3f1634940 || >=901271e0403af638c224987c2a4e55cebade7e91 <f02334a9e378f7e07232b26dc3d2ab353339f040 || >=901271e0403af638c224987c2a4e55cebade7e91 <f4013598b69457dbea350df52e52daea6faef8eb || >=901271e0403af638c224987c2a4e55cebade7e91 <1b8fb5a20508bfb0db854e01214888c761b3a911 || >=901271e0403af638c224987c2a4e55cebade7e91 <c1cda72f6acec02ebd45d913bf8527ff77336ba6 || >=901271e0403af638c224987c2a4e55cebade7e91 <9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8 | 8bfdfe0dbb36a650b7c4dec1aeae078319938a0b, dc4b577a083b361d25e118dc96d8281255ebe22c, dfdfd987f1917c84766e097a6120a1f3f1634940, f02334a9e378f7e07232b26dc3d2ab353339f040, f4013598b69457dbea350df52e52daea6faef8eb, 1b8fb5a20508bfb0db854e01214888c761b3a911, c1cda72f6acec02ebd45d913bf8527ff77336ba6, 9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8 |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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: 1. tipc_udp_mtu_bad() -- called from __tipc_nl_media_set() (MEDIA_SET) 2. inline check in __tipc_nl_bearer_set() at bearer.c:1160 (BEARER_SET) Fix both by rejecting MTU values above U16_MAX.
Quoted source text, attributed separately from HOL analysis.