Description
In the Linux kernel, the following vulnerability has been resolved: md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime After commit ec6bb299c7c3 ("md/md-bitmap: add 'sync_size' into struct md_bitmap_stats"), following panic is reported: Oops: general protection fault, probably for non-canonical address RIP: 0010:bitmap_get_stats+0x2b/0xa0 Call Trace: <TASK> md_seq_show+0x2d2/0x5b0 seq_read_iter+0x2b9/0x470 seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6c/0xf0 do_syscall_64+0x82/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Root cause is that bitmap_get_stats() can be called at anytime if mddev is still there, even if bitmap is destroyed, or not fully initialized. Deferenceing bitmap in this case can crash the kernel. Meanwhile, the above commit start to deferencing bitmap->storage, make the problem easier to trigger. Fix the problem by protecting bitmap_get_stats() with bitmap_info.mutex.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
32a7627cf3a35396a8e834faf34e38ae9f3b1309 to < eb2f9d98cd3e94a79fbf8fb90637c5b12e805428affected32a7627cf3a35396a8e834faf34e38ae9f3b1309 to < 032fa54f486eac5507976e7e31f079a767bc13a8affected32a7627cf3a35396a8e834faf34e38ae9f3b1309 to < 52848a095b55a302af92f52ca0de5b3112059bb8affected32a7627cf3a35396a8e834faf34e38ae9f3b1309 to < 237e19519c8ff6949f0ef57c4a0243f5b2b0fa18affected32a7627cf3a35396a8e834faf34e38ae9f3b1309 to < 4e9316eee3885bfb311b4759513f2ccf37891c09affected32a7627cf3a35396a8e834faf34e38ae9f3b1309 to < 8d28d0ddb986f56920ac97ae704cc3340a699a30affected
Linux Linux
Default version status: affected
2.6.13affected0 to < 2.6.13unaffected5.15.209 to ≤ 5.15.*unaffected6.1.130 to ≤ 6.1.*unaffected6.6.80 to ≤ 6.6.*unaffected6.12.13 to ≤ 6.12.*unaffected6.13.2 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/eb2f9d98cd3e94a79fbf8fb90637c5b12e805428 ↗
- https://git.kernel.org/stable/c/032fa54f486eac5507976e7e31f079a767bc13a8 ↗
- https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 ↗
- https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 ↗
- https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 ↗
- https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30 ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗