CVE-2026-74743
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)
macvlan: inherit needed_headroom and needed_tailroom from lowerdev
In the Linux kernel, the following vulnerability has been resolved: macvlan: inherit needed_headroom and needed_tailroom from lowerdev macvlan devices inherit hard_header_len from lowerdev during macvlan_init(), but leave needed_headroom and needed_tailroom set to 0. When the underlying lowerdev requires extra headroom or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx headroom), upper layers calculating packet headroom and tailroom fail to reserve sufficient space. This can result in reallocation overhead, skb headroom underflows, or KASAN slab-use-after-free crashes when dev_hard_header() / macvlan_hard_header() prepends header data or when lower devices append tailroom. Fix this by: 1. Inheriting needed_headroom and needed_tailroom from lowerdev in macvlan_init(). 2. Propagating needed_headroom and needed_tailroom updates to attached macvlans in macvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.
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) |
|---|---|---|---|---|---|
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | c2ef3f134b069c54b9cc95cce1a16c38c4939336 | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | 7b0eb3e0f363ca79a3af9efd2e87c6258f11da2b | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | 8cd90e850e434577bf6774778657d26d6995e53f | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | 28afc87bd8da0b3348bbbd834c8a89e83712cf5e | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | 8f6a05dbac05725e0786701eb04778c5bdbe4eaa | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | 96fa90b74385b7f2b0d97251dd43d5ee6ca44668 | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | bc9a00fb78e32bccc39d763bfd13a450705bac5d | Unavailable | None listed |
| b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 | affected | git | cef51860becd9700217c81732ca1eb1ea6ed6fe1 | 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) |
|---|---|---|---|---|---|
| 2.6.23 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 2.6.23 | Unavailable | None listed |
| 5.10.271 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.222 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.184 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.153 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.105 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.46 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.10 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |