md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.15.209, 6.1.130, 6.6.80, 6.12.13, 6.13.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 32a7627cf3a35396a8e834faf34e38ae9f3b1309 · fixed in eb2f9d98cd3e94a79fbf8fb90637c5b12e805428; From 32a7627cf3a35396a8e834faf34e38ae9f3b1309 · fixed in 032fa54f486eac5507976e7e31f079a767bc13a8; From 32a7627cf3a35396a8e834faf34e38ae9f3b1309 · fixed in 52848a095b55a302af92f52ca0de5b3112059bb8; From 32a7627cf3a35396a8e834faf34e38ae9f3b1309 · fixed in 237e19519c8ff6949f0ef57c4a0243f5b2b0fa18; From 32a7627cf3a35396a8e834faf34e38ae9f3b1309 · fixed in 4e9316eee3885bfb311b4759513f2ccf37891c09; From 32a7627cf3a35396a8e834faf34e38ae9f3b1309 · fixed in 8d28d0ddb986f56920ac97ae704cc3340a699a30
- Linux Linux
2.6.13
- KernelLinux
From 2.6.13 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.130; From 6.2.0 · fixed in 6.6.80; From 6.7.0 · fixed in 6.12.13; From 6.13.0 · fixed in 6.13.2