md/md-bitmap: fix GPF in bitmap_get_stats()

Summary

In the Linux kernel, the following vulnerability has been resolved: md/md-bitmap: fix GPF in bitmap_get_stats() The commit message of commit 6ec1f0239485 ("md/md-bitmap: fix stats collection for external bitmaps") states: Remove the external bitmap check as the statistics should be available regardless of bitmap storage location. Return -EINVAL only for invalid bitmap with no storage (neither in superblock nor in external file). But, the code does not adhere to the above, as it does only check for a valid super-block for "internal" bitmaps. Hence, we observe: Oops: GPF, probably for non-canonical address 0x1cd66f1f40000028 RIP: 0010:bitmap_get_stats+0x45/0xd0 Call Trace: seq_read_iter+0x2b9/0x46a seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6d/0xf0 do_syscall_64+0x8c/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e We fix this by checking the existence of a super-block for both the internal and external case.

Timeline

1. Jul 25, 2025, 3:27 PM UTCCVE published
2. Oct 15, 2026, 1:07 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 065f4b1cd41d03702426af44193894b925607073 · fixed in a23b16ba3274961494f5ad236345d238364349ff; From 0b5390aeaa85eb2f15e0e2ea0731c0995285db5e · fixed in 3d82a729530bd2110ba66e4a1f73461c776edec2; From eeeba7f43ae27835718a5f5ad6552a8983e75201 · fixed in 3e0542701b37aa25b025d8531583458e4f014c2e; From 6ec1f0239485028445d213d91cfee5242f3211ba · fixed in a18f9b08c70e10ea3a897058fee8a4f3b4c146ec; From 6ec1f0239485028445d213d91cfee5242f3211ba · fixed in c17fb542dbd1db745c9feac15617056506dd7195; From 6.1.135 · fixed in 6.1.146; From 6.6.88 · fixed in 6.6.99; From 6.12.25 · fixed in 6.12.39; From 6.14.4 · fixed in 6.15

• Linux Linux

  6.15

• KernelLinux

  fixed in 6.1.146; From 6.2.0 · fixed in 6.6.99; From 6.7.0 · fixed in 6.12.39; From 6.13.0 · fixed in 6.15.7

References 5