CVE-2026-98272

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < 5cefdb7acfc646fbded59ae77dfe0aac4c9e4a3caffected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < 4ac1d5adc4f4dbafbfd270b55cc6d8bf9849d545affected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < dfd46b5584a5881b131008767950e1ab82713c8caffected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < 6569fd85b0ef9a8a6f20b7eb868420b8c7c0c2a0affected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < e7f30dcfa6c64033bf9137362517bd248e5be384affected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < f0e7d62c1eb984dd204095118973c59604144cd8affected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < 1734c3fc0066e228ce1c11e434b7c2527f0a949aaffected
LinuxLinux7d04b0b13b1175ce0c4bdc77f1278c1f120f874f < 14cb1e7702e5cb3c58888f6aed498381a73927d2affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.10.271 <= 5.10.*unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References