GHSA-FWQW-J57J-H6CJ
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In the Linux kernel, the following vulnerability has been resolved:
xsk: fix NULL pointer dereference in __xsk_rcv()
In the __xsk_rcv() multi-buffer path, xsk_buff_alloc() is called in a loop without checking its return value. xsk_buff_can_alloc() only counts fill queue entries without validating their addresses, so it can succeed while xsk_buff_alloc() rejects all remaining entries and returns NULL.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:__xsk_rcv+0x426/0xc20 (net/xdp/xsk.c:350) Call Trace: xsk_generic_rcv+0x26d/0x5f0 xdp_do_generic_redirect+0x3c5/0xcf0 do_xdp_generic+0x92f/0xe70 __netif_receive_skb_core.constprop.0+0xf7e/0x2b30
Fix this with a two-stage transaction. First allocate and stage all buffers required for the packet, recycling all staged buffers with xsk_buff_free() if any allocation fails. Only after this stage succeeds, copy the data, reserve the RX descriptors, and release the buffers in an error-free loop.
{
"affected": [],
"aliases": [
"CVE-2026-90115"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:03Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix NULL pointer dereference in __xsk_rcv()\n\nIn the __xsk_rcv() multi-buffer path, xsk_buff_alloc() is called in a\nloop without checking its return value. xsk_buff_can_alloc() only\ncounts fill queue entries without validating their addresses, so it\ncan succeed while xsk_buff_alloc() rejects all remaining entries and\nreturns NULL.\n\n Oops: general protection fault, probably for non-canonical address\n 0xdffffc0000000000\n KASAN: null-ptr-deref in range\n [0x0000000000000000-0x0000000000000007]\n RIP: 0010:__xsk_rcv+0x426/0xc20 (net/xdp/xsk.c:350)\n Call Trace:\n xsk_generic_rcv+0x26d/0x5f0\n xdp_do_generic_redirect+0x3c5/0xcf0\n do_xdp_generic+0x92f/0xe70\n __netif_receive_skb_core.constprop.0+0xf7e/0x2b30\n\nFix this with a two-stage transaction. First allocate and stage all\nbuffers required for the packet, recycling all staged buffers with\nxsk_buff_free() if any allocation fails. Only after this stage\nsucceeds, copy the data, reserve the RX descriptors, and release the\nbuffers in an error-free loop.",
"id": "GHSA-fwqw-j57j-h6cj",
"modified": "2026-09-17T18:31:51Z",
"published": "2026-09-17T18:31:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90115"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/214fb79b0379cb0214905632a2537c0c33f594eb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/60d7d3559ce66e227e195e9463cdfed8077c8659"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8341bd3ff126d85bc8c4ed52eedcaa5b1a65f194"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aaebce297efc3e3dccb98a6ff838cfaa47db08db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e37b2abca80473e106176e41712a369fd2f72117"
}
],
"schema_version": "1.4.0",
"severity": []
}
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