Linux Kernel memory block reference leak in drivers/base/memory
CVE-2026-64182 Published on July 19, 2026
drivers/base/memory: fix memory block reference leak in poison accounting
In the Linux kernel, the following vulnerability has been resolved:
drivers/base/memory: fix memory block reference leak in poison accounting
memblk_nr_poison_inc() and memblk_nr_poison_sub() look up a memory block
via find_memory_block_by_id(), which acquires a reference to the memory
block device.
Both helpers use the returned memory block without dropping that
reference, leaking the device reference on each successful lookup. Drop
the reference after updating nr_hwpoison.
Products Associated with CVE-2026-64182
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Affected Versions
Linux:- Version 5033091de814ab4b5623faed2755f3064e19e2d2 and below 686b4283f82cd630fafd7ca9b03dfc080b3ec8fa is affected.
- Version 5033091de814ab4b5623faed2755f3064e19e2d2 and below ce60d9452a0f2effa72fd20ea270c59ca691d455 is affected.
- Version 5033091de814ab4b5623faed2755f3064e19e2d2 and below 24840b3139d7415144b81e4f9f4c44670d15bed9 is affected.
- Version 5033091de814ab4b5623faed2755f3064e19e2d2 and below 8502e2c2d0633f99d94d22ae8dabc10caae1fc2a is affected.
- Version 5033091de814ab4b5623faed2755f3064e19e2d2 and below 03a2cc1756a0570f887d624cd6c535ea0cbd4951 is affected.
- Version 6.2 is affected.
- Before 6.2 is unaffected.
- Version 6.6.142, <= 6.6.* is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.