CVE-2026-74496
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)
fou: Fix use-after-free in fou_create()
In the Linux kernel, the following vulnerability has been resolved: fou: Fix use-after-free in fou_create() fou_create() publishes struct fou through sk_user_data before adding the new FOU port to the per-netns list. If fou_add_to_port_list() fails, the error path frees fou while it is still reachable through sk_user_data. A concurrent receive can then dereference the freed object in fou_from_sock(). This ordering issue was previously noted in the linked discussion. The failure is reachable when local port 0 is requested. Each socket binds to a different ephemeral port, but fou_cfg_cmp() compares the requested port 0 and reports -EALREADY once an entry already exists. Release the tunnel socket before freeing fou so sk_user_data is cleared first, and defer reclamation with kfree_rcu() to protect concurrent RCU readers. This matches the lifetime handling in fou_release().
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) |
|---|---|---|---|---|---|
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | 0ee628a58d83e571f36ec9f07624d6845e420c50 | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | a6fca682cfa2041e31aa72cc397c4a1406eb7468 | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | b3f9c3e60aa25453774f899d25b5e61dd0bec1d5 | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | 99f4d3120b244f92e5df787152041296a2860cb5 | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | 58835985c035a8333742f829ad7e0889a082f9d3 | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | 9042867d4701728f0c6527215b11471759904d8f | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | a28d8903bfe76089ea4bbdbff9976965f9ef8107 | Unavailable | None listed |
| 23461551c00628c3f3fe9cf837bf53cf8f212b63 | affected | git | b14361aca6350ff7907b0e9903c7b94dc7d5d4a0 | 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) |
|---|---|---|---|---|---|
| 3.18 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.18 | Unavailable | None listed |
| 5.10.271 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.222 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.189 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.158 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.111 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.53 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.8 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |