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.

https://git.kernel.org/stable/c/0eb4c16c4adb262763bda870a8ed38a1a9dec7ec

https://git.kernel.org/stable/c/1acdd14c0990dd1cd4b6534f00366d2e6dfce05f

https://git.kernel.org/stable/c/21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d

https://git.kernel.org/stable/c/406e8a651a7b854c41fecd5117bb282b3a6c2c6b

https://git.kernel.org/stable/c/9bb86d8184b37503816150c4a6ad3c17dfdbe827

https://git.kernel.org/stable/c/d22cc92bc41290e5783a72375e0843d9435f6001

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