CVE-2026-89552Medium· 5.5▾ SunlitIn 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 val…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 4.1
none → medium
— → 4.1
none → medium
— → 4.1
none → medium
0.2% → 0.2%
4.1 → 5.5
Last analysed / modified upstream
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.
Linux >= e180a6b7759a99a28cbcce3547c4c80822cb6c2a < 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1Linux >= e180a6b7759a99a28cbcce3547c4c80822cb6c2a < 614f873268c5b172804c9af6639bd17b7e1e2359Linux >= e180a6b7759a99a28cbcce3547c4c80822cb6c2a < 704ecd010d4a9b33160e40b74eb402f6b86a18e0Linux >= e180a6b7759a99a28cbcce3547c4c80822cb6c2a < 0d8e2404925a0607ffec79a53170715a46936896Linux >= e180a6b7759a99a28cbcce3547c4c80822cb6c2a < 3dfaae04243cde460d82dfc2a7dd0bb6664d20aeLinux 2.6.30Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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