GHSA-986M-Q5F3-3M78
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In the Linux kernel, the following vulnerability has been resolved:
net: mvpp2: prevent buffer overflow in page_pool allocation
The per‑processor buffering scheme is supported only if the number of pools (nrxqs * 2) does not exceed MVPP2_BM_MAX_POOLS (8). This is already checked in mvpp2_probe() during the initial activation of percpu_pools.
However, mvpp2_change_mtu() may later call mvpp2_bm_switch_buffers(priv, true) without this check, which can lead to an out-of-bounds access in the priv->page_pool array in mvpp2_bm_init(). The array is sized to hold MVPP2_PORT_MAX_RXQ entries, and mvpp2_get_nrxqs() may return exactly that value. The per-CPU scheme then doubles it to nrxqs * 2, exceeding the array bounds.
Check that the hardware version is MVPP22 or newer and that the number of pools (nrxqs * 2) does not exceed MVPP2_BM_MAX_POOLS before switching to per-CPU mode.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
{
"affected": [],
"aliases": [
"CVE-2026-98272"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:16Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvpp2: prevent buffer overflow in page_pool allocation\n\nThe per\u2011processor buffering scheme is supported only if the\nnumber of pools (nrxqs\u202f*\u202f2) does not exceed MVPP2_BM_MAX_POOLS (8).\nThis is already checked in mvpp2_probe() during the initial\nactivation of percpu_pools.\n\nHowever, mvpp2_change_mtu() may later call\nmvpp2_bm_switch_buffers(priv, true) without this check, which can\nlead to an out-of-bounds access in the priv-\u003epage_pool array in\nmvpp2_bm_init(). The array is sized to hold MVPP2_PORT_MAX_RXQ\nentries, and mvpp2_get_nrxqs() may return exactly that value. The\nper-CPU scheme then doubles it to nrxqs * 2, exceeding the array\nbounds.\n\nCheck that the hardware version is MVPP22 or newer and that the\nnumber of pools (nrxqs * 2) does not exceed MVPP2_BM_MAX_POOLS\nbefore switching to per-CPU mode.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE.",
"id": "GHSA-986m-q5f3-3m78",
"modified": "2026-10-06T09:31:33Z",
"published": "2026-10-06T09:31:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98272"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/14cb1e7702e5cb3c58888f6aed498381a73927d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1734c3fc0066e228ce1c11e434b7c2527f0a949a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4ac1d5adc4f4dbafbfd270b55cc6d8bf9849d545"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5cefdb7acfc646fbded59ae77dfe0aac4c9e4a3c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6569fd85b0ef9a8a6f20b7eb868420b8c7c0c2a0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dfd46b5584a5881b131008767950e1ab82713c8c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e7f30dcfa6c64033bf9137362517bd248e5be384"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0e7d62c1eb984dd204095118973c59604144cd8"
}
],
"schema_version": "1.4.0",
"severity": []
}
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