Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: vlan: ensure sufficient headroom in vlan_dev_hard_header() Callers that only reserve ETH_HLEN or less (such as llc_alloc_frame()), or skbs allocated before dynamic device/headroom changes (e.g. toggling VLAN_FLAG_REORDER_HDR or bonding/team switching slaves), can reach vlan_dev_hard_header() with insufficient headroom and trigger skb_under_panic(). Use skb_cow_head() in vlan_dev_hard_header() when VLAN_FLAG_REORDER_HDR is not set to ensure sufficient headroom for the VLAN header(s) and the underlying device hard header. Use READ_ONCE() to read dev->hard_header_len and dev->needed_headroom as they can be updated concurrently under RTNL (e.g. in vlan_transfer_features()) while vlan_dev_hard_header() runs locklessly on the transmit path. Also avoid LL_RESERVED_SPACE(dev) here so that the extra HH_DATA_MOD alignment padding does not trigger unnecessary pskb_expand_head() reallocations on inner stacked VLAN devices after the outer VLAN header has been pushed.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 55e007fc3b4d76fa4d6b4660f6904fe6ab045a1b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5aca8e6a8ff6aeae358c1d9b65447aac416ace95; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4ba1f57313f36a3ce6f77d593548f0c511f34aa1; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ca797491f0ae4bfde9039f79f6f1ed7781c9110f; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cfba0f45553de2b803059e3d539a1e418df24da8; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c7ee4bea64f559ea8e03260014775b64c720cb5b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 90d51095371d96747f45bbd8504edf6513e039ef; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cd5dd68267c4238795fadaf02b3575ca3f8a6500 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.55 through 6.18.*; unaffected 7.2.9 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/55e007fc3b4d76fa4d6b4660f6904fe6ab045a1b
- https://git.kernel.org/stable/c/5aca8e6a8ff6aeae358c1d9b65447aac416ace95
- https://git.kernel.org/stable/c/4ba1f57313f36a3ce6f77d593548f0c511f34aa1
- https://git.kernel.org/stable/c/ca797491f0ae4bfde9039f79f6f1ed7781c9110f
- https://git.kernel.org/stable/c/cfba0f45553de2b803059e3d539a1e418df24da8
- https://git.kernel.org/stable/c/c7ee4bea64f559ea8e03260014775b64c720cb5b
- https://git.kernel.org/stable/c/90d51095371d96747f45bbd8504edf6513e039ef
- https://git.kernel.org/stable/c/cd5dd68267c4238795fadaf02b3575ca3f8a6500