CVE-2026-80978
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)
net: cap advertised IP tunnel headroom
In the Linux kernel, the following vulnerability has been resolved: net: cap advertised IP tunnel headroom IP tunnel devices derive their advertised needed_headroom from lower output devices. A stack of user-created devices can make the derived value larger than the 16-bit skb header offsets can represent. Once IP output reserves it, skb head expansion can wrap those offsets. The runtime transmit path already caps a growing needed_headroom at 512. Apply the same cap when tunnel configuration publishes needed_headroom derived from a lower output device. Capping the advertised value is safe: IP tunnel transmit still expands the skb when a packet needs more headroom. A nonsensical stacked configuration can therefore incur an extra reallocation, but it cannot publish an unbounded reservation to upper layers.
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) |
|---|---|---|---|---|---|
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | fb889a619723032140f5d983a3a34d25a5a2bed4 | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | b160422f8103574425e2834130e169d84c94fa1d | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | d36e75f5669140b66515ad3a176ca6337bd80a5e | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | 84783961cb8bdb36b4f41a02ce43aafc6d52b176 | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | bc4e05ae66c9797a0972ac44326e69c5305e0020 | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | af0ee8f04bea22cdb331fa3509e17f81b48938ad | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | 9144f2c53a04465a6878172b523f640313c5559e | Unavailable | None listed |
| 1a37e412a0225fcba5587f24c0dfc7636efc8b69 | affected | git | 6b222adeb9340306e2ff97127c76117abb9b3df8 | 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) |
|---|---|---|---|---|---|
| 3.11 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.11 | Unavailable | None listed |
| 5.10.270 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.221 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.188 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.109 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.50 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.4 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |