Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in non-ring send paths packet_snd() reads dev->hard_header_len multiple times while allocating and constructing an skb. Device reconfiguration can change this value concurrently, for example through bonding device type changes. For SOCK_RAW, packet_snd() can save a larger value in reserve and later allocate headroom using a smaller value. Moving skb->data back by reserve then places it before skb->head, and the following copy from userspace can attempt an out-of-bounds write. packet_sendmsg_spkt() has the same issue because it calculates its reservation and header offset from separate reads before dropping the RCU read lock to allocate the skb. Add LL_RESERVED_SPACE_EX() for callers that already saved a header length. Read hard_header_len once in packet_snd() and use it for allocation and construction. In packet_sendmsg_spkt(), preserve the allocation-time value through the device lookup retry. The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before 78a47127e33c340bc6d38dcc4552a094b4f5cc77; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before 142e287b3a25cfe909215177c23243e7fc5ae2b1; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before 91f041451f967cd87ed722a8f43c0b767a64f1a0; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before 9052756290962ffb9a661bcf319e92dedaaedfed; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before 5bb10753d428aadfc356a2bfe9acea09c82a62ec; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before b06b6fce6d7deaf7238e09b48ce3b1125ff41acd; affected b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba before 03390aa32e669cc4ecd7d34108e2e1afc13d689d; affected d9fb8cc230b2a4757e9fe4f81468f81212d4deaa; affected 6190cce26e40bf71c4d375b21eea74bb07b6a0f3; affected 01a658c1b9d4b5393c38d5a92d9112ab1425382a; affected 8809ae6747e760e6f1d2453ceb08c9bcc4939766; affected 4.4.133 before 4.5; affected 4.9.103 before 4.10; affected 4.14.44 before 4.15; affected 4.16.12 before 4.17 |
| Linux / Linux | affected 4.17; unaffected 0 before 4.17; unaffected 5.10.267 through 5.10.*; unaffected 5.15.218 through 5.15.*; unaffected 6.1.185 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/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812
- https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77
- https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1
- https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0
- https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed
- https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec
- https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd
- https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d
ADP enrichment
No English description supplied.
No references supplied.