CVE-2026-80679 PUBLISHED

s390/dasd: Fix potential NULL pointer dereference

Assigner: Linux
Reserved: 26.08.2026 Published: 28.08.2026 Updated: 28.08.2026

In the Linux kernel, the following vulnerability has been resolved:

s390/dasd: Fix potential NULL pointer dereference

dasd_release_space() checks the implementation of the is_ese() discipline function before calling it to determine if a given device is an ESE DASD.

The current usage of the logical AND operator will lead to a NULL pointer dereference as the function is called even if the function pointer is NULL.

Fix this by using the logical OR operator.

Vendor	Linux
Product	Linux
Versions	Default: unaffected affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to dbf2ae34d2f1390a9fc1abf3dce7f809e022caae (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to 3000367a512b1283ca52230bf21f8c91dfbec45b (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to cdc7b73d0c5a9cd6360b4f8c36eae23b02097e4c (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to e156c70c505c6c9adce3b7be5a82025f00544709 (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to 3453a993a3f14c1684560ecf26585046976f6ac6 (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to 86cdfd061509bcde84f3145f7221ba64e3e53b1f (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to 96b8e09b09539f252a5eeea6baebd93c2e3779bd (excl.) affected from 91dc4a197569230683ca8bad551e655a4bf14c30 to 9973026f572db6b67570cadc30942f3014e41079 (excl.)

Vendor	Linux
Product	Linux
Versions	Default: affected Version 5.3 is affected unaffected from 0 to 5.3 (excl.) unaffected from 5.10.265 to 5.10.* (incl.) unaffected from 5.15.216 to 5.15.* (incl.) unaffected from 6.1.183 to 6.1.* (incl.) unaffected from 6.6.151 to 6.6.* (incl.) unaffected from 6.12.103 to 6.12.* (incl.) unaffected from 6.18.44 to 6.18.* (incl.) unaffected from 7.1.8 to 7.1.* (incl.) unaffected from 7.2 to * (incl.)