CVE-2025-21631
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21631
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21631.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-21631
- Downstream
- Related
- Published
- 2025-01-19T10:17:49Z
- Modified
- 2025-10-10T06:49:50.523511Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- block, bfq: fix waker_bfqq UAF after bfq_split_bfqq()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
block, bfq: fix wakerbfqq UAF after bfqsplit_bfqq()
Our syzkaller report a following UAF for v6.6:
BUG: KASAN: slab-use-after-free in bfqinitrq+0x175d/0x17a0 block/bfq-iosched.c:6958 Read of size 8 at addr ffff8881b57147d8 by task fsstress/232726
CPU: 2 PID: 232726 Comm: fsstress Not tainted 6.6.0-g3629d1885222 #39 Call Trace: <TASK> _dumpstack lib/dumpstack.c:88 [inline] dumpstacklvl+0x91/0xf0 lib/dumpstack.c:106 printaddressdescription.constprop.0+0x66/0x300 mm/kasan/report.c:364 printreport+0x3e/0x70 mm/kasan/report.c:475 kasanreport+0xb8/0xf0 mm/kasan/report.c:588 hlistaddhead include/linux/list.h:1023 [inline] bfqinitrq+0x175d/0x17a0 block/bfq-iosched.c:6958 bfqinsertrequest.isra.0+0xe8/0xa20 block/bfq-iosched.c:6271 bfqinsertrequests+0x27f/0x390 block/bfq-iosched.c:6323 blkmqinsertrequest+0x290/0x8f0 block/blk-mq.c:2660 blkmqsubmitbio+0x1021/0x15e0 block/blk-mq.c:3143 _submitbio+0xa0/0x6b0 block/blk-core.c:639 _submitbionoacctmq block/blk-core.c:718 [inline] submitbionoacctnocheck+0x5b7/0x810 block/blk-core.c:747 submitbionoacct+0xca0/0x1990 block/blk-core.c:847 _ext4readbh fs/ext4/super.c:205 [inline] ext4readbh+0x15e/0x2e0 fs/ext4/super.c:230 _readextenttreeblock+0x304/0x6f0 fs/ext4/extents.c:567 ext4findextent+0x479/0xd20 fs/ext4/extents.c:947 ext4extmapblocks+0x1a3/0x2680 fs/ext4/extents.c:4182 ext4mapblocks+0x929/0x15a0 fs/ext4/inode.c:660 ext4iomapbeginreport+0x298/0x480 fs/ext4/inode.c:3569 iomapiter+0x3dd/0x1010 fs/iomap/iter.c:91 iomapfiemap+0x1f4/0x360 fs/iomap/fiemap.c:80 ext4fiemap+0x181/0x210 fs/ext4/extents.c:5051 ioctlfiemap.isra.0+0x1b4/0x290 fs/ioctl.c:220 dovfsioctl+0x31c/0x11a0 fs/ioctl.c:811 _dosysioctl fs/ioctl.c:869 [inline] _sesysioctl+0xae/0x190 fs/ioctl.c:857 dosyscallx64 arch/x86/entry/common.c:51 [inline] dosyscall64+0x70/0x120 arch/x86/entry/common.c:81 entrySYSCALL64afterhwframe+0x78/0xe2
Allocated by task 232719: kasansavestack+0x22/0x50 mm/kasan/common.c:45 kasansettrack+0x25/0x30 mm/kasan/common.c:52 _kasanslaballoc+0x87/0x90 mm/kasan/common.c:328 kasanslaballoc include/linux/kasan.h:188 [inline] slabpostallochook mm/slab.h:768 [inline] slaballocnode mm/slub.c:3492 [inline] kmemcacheallocnode+0x1b8/0x6f0 mm/slub.c:3537 bfqgetqueue+0x215/0x1f00 block/bfq-iosched.c:5869 bfqgetbfqqhandlesplit+0x167/0x5f0 block/bfq-iosched.c:6776 bfqinitrq+0x13a4/0x17a0 block/bfq-iosched.c:6938 bfqinsertrequest.isra.0+0xe8/0xa20 block/bfq-iosched.c:6271 bfqinsertrequests+0x27f/0x390 block/bfq-iosched.c:6323 blkmqinsertrequest+0x290/0x8f0 block/blk-mq.c:2660 blkmqsubmitbio+0x1021/0x15e0 block/blk-mq.c:3143 _submitbio+0xa0/0x6b0 block/blk-core.c:639 _submitbionoacctmq block/blk-core.c:718 [inline] submitbionoacctnocheck+0x5b7/0x810 block/blk-core.c:747 submitbionoacct+0xca0/0x1990 block/blk-core.c:847 _ext4readbh fs/ext4/super.c:205 [inline] ext4readbhnowait+0x15a/0x240 fs/ext4/super.c:217 ext4readbhlock+0xac/0xd0 fs/ext4/super.c:242 ext4breadbatch+0x268/0x500 fs/ext4/inode.c:958 _ext4findentry+0x448/0x10f0 fs/ext4/namei.c:1671 ext4lookupentry fs/ext4/namei.c:1774 [inline] ext4lookup.part.0+0x359/0x6f0 fs/ext4/namei.c:1842 ext4lookup+0x72/0x90 fs/ext4/namei.c:1839 _lookupslow+0x257/0x480 fs/namei.c:1696 lookupslow fs/namei.c:1713 [inline] walkcomponent+0x454/0x5c0 fs/namei.c:2004 linkpathwalk.part.0+0x773/0xda0 fs/namei.c:2331 linkpathwalk fs/namei.c:3826 [inline] pathopenat+0x1b9/0x520 fs/namei.c:3826 dofilpopen+0x1b7/0x400 fs/namei.c:3857 dosysopenat2+0x5dc/0x6e0 fs/open.c:1428 dosysopen fs/open.c:1443 [inline] _dosysopenat fs/open.c:1459 [inline] _sesysopenat fs/open.c:1454 [inline] _x64sysopenat+0x148/0x200 fs/open.c:1454 dosyscallx64 arch/x86/entry/common.c:51 [inline] dosyscall6 ---truncated---
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2550149fcdf2934155ff625d76ad4e3d4b25bbc6
- https://git.kernel.org/stable/c/bc2aeb35ff167e0c6b0cedf0c96a5c41e6cba1ed
- https://git.kernel.org/stable/c/be3eed59ac01f429ac10aaa46e26f653bcf581ab
- https://git.kernel.org/stable/c/f587c1ac68956c4703857d650d9b1cd7bb2ac4d7
- https://git.kernel.org/stable/c/fcede1f0a043ccefe9bc6ad57f12718e42f63f1d
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced63a07379fdb6c72450cb05294461c6016b8b7726Fixedf587c1ac68956c4703857d650d9b1cd7bb2ac4d7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedde0456460f2abf921e356ed2bd8da87a376680bdFixed2550149fcdf2934155ff625d76ad4e3d4b25bbc6
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0780451f03bf518bc032a7c584de8f92e2d39d7fFixedbe3eed59ac01f429ac10aaa46e26f653bcf581ab
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced1ba0403ac6447f2d63914fb760c44a3b19c44eafFixedbc2aeb35ff167e0c6b0cedf0c96a5c41e6cba1ed
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced1ba0403ac6447f2d63914fb760c44a3b19c44eafFixedfcede1f0a043ccefe9bc6ad57f12718e42f63f1d
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0b8bda0ff17156cd3f60944527c9d8c9f99f1583
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedcae58d19121a70329cf971359e2518c93fec04fe
Affected versions
v5.*
v6.*
Linux / Kernel
Package
- Name
- Kernel