Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: skmsg: preserve sg.copy across SG transforms The sk_msg sg.copy bitmap is part of the scatterlist entry ownership state. A set bit tells sk_msg_compute_data_pointers() not to expose the entry through writable BPF ctx->data. This protects entries backed by pages that are not private to the sk_msg, such as splice-backed file page-cache pages. Several sk_msg transform paths move, copy, split, or compact msg->sg.data[] entries without moving the matching sg.copy bit. This can make an externally backed entry arrive at a new slot with a clear copy bit. A later SK_MSG verdict can then expose sg_virt(sge) as writable ctx->data and BPF stores can modify the original page cache. Keep sg.copy synchronized with sg.data[] whenever entries are transferred, shifted, split, or copied into a new sk_msg. Clear the bit when an entry is replaced by a newly allocated private page or freed. This covers the BPF pull/push/pop helpers, sk_msg_shift_left/right(), sk_msg_xfer(), and tls_split_open_record(), including the partial tail entry created during TLS open-record splitting.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before f126eed589eec6f201405abbc398844042ef6d57; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before 31a110642b5fb5e61940cbcfb503445ac4f28017; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before 9bb86d8184b37503816150c4a6ad3c17dfdbe827; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before 0eb4c16c4adb262763bda870a8ed38a1a9dec7ec; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before d22cc92bc41290e5783a72375e0843d9435f6001; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before 1acdd14c0990dd1cd4b6534f00366d2e6dfce05f; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before 21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d; affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca before 406e8a651a7b854c41fecd5117bb282b3a6c2c6b |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.177 through 6.1.*; unaffected 6.6.144 through 6.6.*; unaffected 6.12.95 through 6.12.*; unaffected 6.18.38 through 6.18.*; unaffected 7.1.3 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f126eed589eec6f201405abbc398844042ef6d57
- https://git.kernel.org/stable/c/31a110642b5fb5e61940cbcfb503445ac4f28017
- https://git.kernel.org/stable/c/9bb86d8184b37503816150c4a6ad3c17dfdbe827
- https://git.kernel.org/stable/c/0eb4c16c4adb262763bda870a8ed38a1a9dec7ec
- https://git.kernel.org/stable/c/d22cc92bc41290e5783a72375e0843d9435f6001
- https://git.kernel.org/stable/c/1acdd14c0990dd1cd4b6534f00366d2e6dfce05f
- https://git.kernel.org/stable/c/21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d
- https://git.kernel.org/stable/c/406e8a651a7b854c41fecd5117bb282b3a6c2c6b
ADP enrichment
No English description supplied.
No references supplied.