CVE-2026-74657
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops
In the Linux kernel, the following vulnerability has been resolved: ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops fib_nlmsg_size() still estimates nexthop space as if every gateway is encoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an IPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA. As a result, route notifications can allocate an skb that is too small. fib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the WARN_ON() that marks such failures as a fib_nlmsg_size() bug. With panic_on_warn set, this becomes a kernel panic. Mirror the actual nexthop dump layout in fib_nlmsg_size(): account for IPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop layout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is actually present.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 57195f0ab5cfbb5ee0864e5aff15ceb48f5a5e28 | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 0f0ca602941d0a81ae9514943ca06c55159c6385 | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 5307a53599fa762c06e475ee4a375252074fd324 | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 7f80ad373ce4a7af5367ff273cea0f16e91387f3 | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 4a5dfbae5179f6574695012a980476254df2d295 | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | a59edda6eda1252340354322d8ab318b2e9052fb | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 9b22f13524fa0de0d963bbd3002df6c28bae3395 | Unavailable | None listed |
| d15662682db232da77136cd348f4c9df312ca6f9 | affected | git | 4ff9548d84945d2cbf9e4c207288063a200ea397 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.2 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.2 | Unavailable | None listed |
| 5.10.267 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.216 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.183 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.152 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.104 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.45 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.9 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |