CVE-2026-89552
Description
In the Linux kernel, the following vulnerability has been resolved: params: fix charp corruption on allocation failure param_set_charp() stores charp parameters in allocated memory after slab is available, and releases the previous value when the parameter is updated. The previous value is released before the replacement allocation succeeds. If kmalloc_parameter() fails, the setter returns -ENOMEM with the parameter left as NULL. Failing zswap's compressor update before zswap is initialized can later trigger: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:strcmp+0x10/0x30 Call Trace: zswap_setup+0x3b1/0x490 zswap_enabled_param_set+0x5b/0xa0 param_attr_store+0x93/0xe0 module_attr_store+0x1c/0x30 kernfs_fop_write_iter+0x116/0x1f0 Allocate and copy the replacement first, then replace the parameter value only after allocation succeeds.
How to fix
- Linux Linux72835d539ed3eb4c4b85b85a3f3976c7bdc70b91, c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f, 32c1f305cfad192cd98468140beedeffe4792f53, 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1, 614f873268c5b172804c9af6639bd17b7e1e2359, 704ecd010d4a9b33160e40b74eb402f6b86a18e0, 0d8e2404925a0607ffec79a53170715a46936896, 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 72835d539ed3eb4c4b85b85a3f3976c7bdc70b91, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 32c1f305cfad192cd98468140beedeffe4792f53, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 614f873268c5b172804c9af6639bd17b7e1e2359, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 704ecd010d4a9b33160e40b74eb402f6b86a18e0, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 0d8e2404925a0607ffec79a53170715a46936896, e180a6b7759a99a28cbcce3547c4c80822cb6c2a ≤ v < 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae, 2.6.30 | 72835d539ed3eb4c4b85b85a3f3976c7bdc70b91, c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f, 32c1f305cfad192cd98468140beedeffe4792f53, 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1, 614f873268c5b172804c9af6639bd17b7e1e2359, 704ecd010d4a9b33160e40b74eb402f6b86a18e0, 0d8e2404925a0607ffec79a53170715a46936896, 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae |
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