CVE-2026-100082 PUBLISHED

xen-blkback: Avoid UAF when reading I/O statistics

Assigner: Linux
Reserved: 25.09.2026 Published: 06.11.2026 Updated: 06.11.2026

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

xen-blkback: Avoid UAF when reading I/O statistics

Reading I/O statistics via sysfs concurrently with tearing down a frontend device might result in UAF or a NULL dereference, as the reading of the statistics data is not synchronized with freeing the data.

Use a rwlock for synchronizing.

This is XSA-528 / CVE-2026-100082

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 253cff0526781e28b1b0f9fdacd74ecdc23d3ab7 (excl.)
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 2c9ccbe0ffcff3615c7ad917c49b67571a41f21c (excl.)
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to 58ba056991dbcec8a75e6861cb4479ac947b69e6 (excl.)
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b (excl.)
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to b764e17313534794aeb99c901869f213e36a16ef (excl.)
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to c49934da934cf495faf782aa5d84f413221c9be6 (excl.)
  • affected from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to b0378161c28e77e4d0e2eda3c9433ab4394d2a2f (excl.)
  • affected from 0 to 5.10.274 (excl.)
  • affected from 0 to 5.15.225 (excl.)
  • affected from 0 to 6.1.192 (excl.)
  • affected from 0 to 6.6.162 (excl.)
  • affected from 0 to 6.12.116 (excl.)
  • affected from 0 to 6.18.62 (excl.)
  • affected from 0 to 7.3.3 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • unaffected from 5.10.274 to 5.10.* (incl.)
  • unaffected from 5.15.225 to 5.15.* (incl.)
  • unaffected from 6.1.192 to 6.1.* (incl.)
  • unaffected from 6.6.162 to 6.6.* (incl.)
  • unaffected from 6.12.116 to 6.12.* (incl.)
  • unaffected from 6.18.62 to 6.18.* (incl.)
  • unaffected from 7.3.3 to 7.3.* (incl.)

References