CVE-2025-40348
Description
In the Linux kernel, the following vulnerability has been resolved: slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts If two competing threads enter alloc_slab_obj_exts() and one of them fails to allocate the object extension vector, it might override the valid slab->obj_exts allocated by the other thread with OBJEXTS_ALLOC_FAIL. This will cause the thread that lost this race and expects a valid pointer to dereference a NULL pointer later on. Update slab->obj_exts atomically using cmpxchg() to avoid slab->obj_exts overrides by racing threads. Thanks for Vlastimil and Suren's help with debugging.
How to fix
- Linux Linuxc7af5300d78460fc5037ddc77113ba3dbfe77dc0, 7c34feda6a9a203c9744281f1b6671b7dad2012d, 6ed8bfd24ce1cb31742b09a3eb557cd008533eec, 6.12.56, 6.17.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 715b6a5b41dae39baeaa40d3386b548bb278b9c2 ≤ v < c7af5300d78460fc5037ddc77113ba3dbfe77dc0, 07e38a54cabd9b4de7ceb7f075f29ffa463e458a ≤ v < 7c34feda6a9a203c9744281f1b6671b7dad2012d, f7381b9116407ba2a429977c80ff8df953ea9354 ≤ v < 6ed8bfd24ce1cb31742b09a3eb557cd008533eec, 6.12.54 ≤ v < 6.12.56, 6.17.4 ≤ v < 6.17.6 | c7af5300d78460fc5037ddc77113ba3dbfe77dc0, 7c34feda6a9a203c9744281f1b6671b7dad2012d, 6ed8bfd24ce1cb31742b09a3eb557cd008533eec, 6.12.56, 6.17.6 |
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