CVE-2026-98272net: mvpp2: prevent buffer overflow in page_pool allocation

Official description

In 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 packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5cefdb7acfc646fbded59ae77dfe0aac4c9e4a3c
• https://git.kernel.org/stable/c/4ac1d5adc4f4dbafbfd270b55cc6d8bf9849d545
• https://git.kernel.org/stable/c/dfd46b5584a5881b131008767950e1ab82713c8c
• https://git.kernel.org/stable/c/6569fd85b0ef9a8a6f20b7eb868420b8c7c0c2a0
• https://git.kernel.org/stable/c/e7f30dcfa6c64033bf9137362517bd248e5be384
• https://git.kernel.org/stable/c/f0e7d62c1eb984dd204095118973c59604144cd8
• https://git.kernel.org/stable/c/1734c3fc0066e228ce1c11e434b7c2527f0a949a
• https://git.kernel.org/stable/c/14cb1e7702e5cb3c58888f6aed498381a73927d2