Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: xsk: Fix fragment node deletion to prevent buffer leak After commit b692bf9a7543 ("xsk: Get rid of xdp_buff_xsk::xskb_list_node"), the list_node field is reused for both the xskb pool list and the buffer free list, this causes a buffer leak as described below. xp_free() checks if a buffer is already on the free list using list_empty(&xskb->list_node). When list_del() is used to remove a node from the xskb pool list, it doesn't reinitialize the node pointers. This means list_empty() will return false even after the node has been removed, causing xp_free() to incorrectly skip adding the buffer to the free list. Fix this by using list_del_init() instead of list_del() in all fragment handling paths, this ensures the list node is reinitialized after removal, allowing the list_empty() to work correctly.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 560c974b7ccd95bb9ff20df77f6654283e45c9c6 before 5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d; affected fd5614763805d6f386bd07cc53558f88b1b1eb62 before 2a9ea988465ece5b6896b1bdc144170a64e84c35; affected b692bf9a7543af7ad11a59d182a3757578f0ba53 before 645c6d8376ad4913cbffe0e0c2cca0c4febbe596; affected b692bf9a7543af7ad11a59d182a3757578f0ba53 before b38cbd4af5034635cff109e08788c63f956f3a69; affected b692bf9a7543af7ad11a59d182a3757578f0ba53 before 60abb0ac11dccd6b98fd9182bc5f85b621688861 |
| Linux / Linux | affected 6.13; unaffected 0 before 6.13; unaffected 6.18.17 through 6.18.*; unaffected 6.19.7 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d
- https://git.kernel.org/stable/c/2a9ea988465ece5b6896b1bdc144170a64e84c35
- https://git.kernel.org/stable/c/645c6d8376ad4913cbffe0e0c2cca0c4febbe596
- https://git.kernel.org/stable/c/b38cbd4af5034635cff109e08788c63f956f3a69
- https://git.kernel.org/stable/c/60abb0ac11dccd6b98fd9182bc5f85b621688861