CVE-2022-48869 (GCVE-0-2022-48869)

Vulnerability from cvelistv5 – Published: 2024-08-21 06:09 – Updated: 2025-05-04 08:25
VLAI?
Title
USB: gadgetfs: Fix race between mounting and unmounting
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: gadgetfs: Fix race between mounting and unmounting The syzbot fuzzer and Gerald Lee have identified a use-after-free bug in the gadgetfs driver, involving processes concurrently mounting and unmounting the gadgetfs filesystem. In particular, gadgetfs_fill_super() can race with gadgetfs_kill_sb(), causing the latter to deallocate the_device while the former is using it. The output from KASAN says, in part: BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline] BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline] BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline] BUG: KASAN: use-after-free in put_dev drivers/usb/gadget/legacy/inode.c:159 [inline] BUG: KASAN: use-after-free in gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086 Write of size 4 at addr ffff8880276d7840 by task syz-executor126/18689 CPU: 0 PID: 18689 Comm: syz-executor126 Not tainted 6.1.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> ... atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline] __refcount_sub_and_test include/linux/refcount.h:272 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] put_dev drivers/usb/gadget/legacy/inode.c:159 [inline] gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 vfs_get_super fs/super.c:1190 [inline] get_tree_single+0xd0/0x160 fs/super.c:1207 vfs_get_tree+0x88/0x270 fs/super.c:1531 vfs_fsconfig_locked fs/fsopen.c:232 [inline] The simplest solution is to ensure that gadgetfs_fill_super() and gadgetfs_kill_sb() are serialized by making them both acquire a new mutex.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e5d82a7360d124ae1a38c2a5eac92ba49b125191 , < 9a39f4626b361ee7aa10fd990401c37ec3b466ae (git)
Affected: e5d82a7360d124ae1a38c2a5eac92ba49b125191 , < 856e4b5e53f21edbd15d275dde62228dd94fb2b4 (git)
Affected: e5d82a7360d124ae1a38c2a5eac92ba49b125191 , < a2e075f40122d8daf587db126c562a67abd69cf9 (git)
Affected: e5d82a7360d124ae1a38c2a5eac92ba49b125191 , < 616fd34d017000ecf9097368b13d8a266f4920b3 (git)
Affected: e5d82a7360d124ae1a38c2a5eac92ba49b125191 , < d18dcfe9860e842f394e37ba01ca9440ab2178f4 (git)
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    Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.230 , ≤ 5.4.* (semver)
Unaffected: 5.10.165 , ≤ 5.10.* (semver)
Unaffected: 5.15.90 , ≤ 5.15.* (semver)
Unaffected: 6.1.8 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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In particular, gadgetfs_fill_super()\\ncan race with gadgetfs_kill_sb(), causing the latter to deallocate\\nthe_device while the former is using it.  The output from KASAN says,\\nin part:\\n\\nBUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]\\nBUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline]\\nBUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]\\nBUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]\\nBUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]\\nBUG: KASAN: use-after-free in put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]\\nBUG: KASAN: use-after-free in gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086\\nWrite of size 4 at addr ffff8880276d7840 by task syz-executor126/18689\\n\\nCPU: 0 PID: 18689 Comm: syz-executor126 Not tainted 6.1.0-syzkaller #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\\nCall Trace:\\n \u003cTASK\u003e\\n...\\n atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline]\\n __refcount_sub_and_test include/linux/refcount.h:272 [inline]\\n __refcount_dec_and_test include/linux/refcount.h:315 [inline]\\n refcount_dec_and_test include/linux/refcount.h:333 [inline]\\n put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]\\n gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086\\n deactivate_locked_super+0xa7/0xf0 fs/super.c:332\\n vfs_get_super fs/super.c:1190 [inline]\\n get_tree_single+0xd0/0x160 fs/super.c:1207\\n vfs_get_tree+0x88/0x270 fs/super.c:1531\\n vfs_fsconfig_locked fs/fsopen.c:232 [inline]\\n\\nThe simplest solution is to ensure that gadgetfs_fill_super() and\\ngadgetfs_kill_sb() are serialized by making them both acquire a new\\nmutex.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:18:10.992Z\"}}}",
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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