Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header dev_validate_header() reads dev->hard_header_len directly when zero-padding short link layer headers for CAP_SYS_RAWIO holders: if (capable(CAP_SYS_RAWIO)) { memset(ll_header + len, 0, dev->hard_header_len - len); return true; } Packet send paths call dev_validate_header() on skbs whose headroom was allocated from an earlier hard_header_len read. If the device is reconfigured so that dev->hard_header_len increases before validation, the memset writes past the reserved buffer, an out-of-bounds write. This out-of-bounds write is masked in some SOCK_RAW paths today because the same concurrent increase can first make skb_push() exceed the reserved headroom and trigger skb_under_panic(). Remove the zero-padding branch before making those hard_header_len reads consistent, so the snapshot fixes do not turn a loud panic into a silent overwrite. This path is only reached for variable length L2 protocols, where len < hard_header_len but len >= min_header_len. No remaining in-tree variable length L2 protocol implements header_ops->validate, and the CAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no real value beyond allowing testing of intentionally malformed input. Drop the CAP_SYS_RAWIO branch. The remaining reads of dev->hard_header_len in dev_validate_header() are comparisons only and have no memory safety impact.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b5518429e70cd783b8ca52335456172c1a0589f6 before 53fd7f912c0877647d6a1e1877f5ea8535ee0b4a; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before 8fc9816404166a90ed8d544dc52482fafffb6d9f; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before b0f92a5731dc82556a9ae005cc35f71ab136307b; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before 99df6b7a713f96eda206680d100b76e15f9d9b69; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before 74e035f07f53feca09e2352e77fccb09cad5e208; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before dbb30dc943a93e083f1e531bfdc6779e57de40d0; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before fc902f52a02298c7432b2334c0c82a2885a1a8b6; affected 2793a23aacbd754dbbb5cb75093deb7e4103bace before 3b9a324e646d3657a8d9806dfbfe4f3e4066e882; affected f58a6c08ebdfa978178bbca78c2ba744a2665912; affected 1df16498dfd0d5a129bdf2982d9a08df73e8923d; affected 8b8d278aa4de9335682bbd4a3bb619af015c859e; affected 6804052fa9d86e9a512c88b24a5debbfc1a490fc; affected 3.2.80 before 3.2.81; affected 3.16.36 before 3.17; affected 4.1.28 before 4.2; affected 4.4.8 before 4.5; affected 4.5.2 before 4.6 |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 3.2.81 through 3.2.*; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.152 through 6.6.*; unaffected 6.12.104 through 6.12.*; unaffected 6.18.45 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a
- https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6
- https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f
- https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b
- https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69
- https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208
- https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0
- https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6
- https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882
ADP enrichment
No English description supplied.
No references supplied.