Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix slab-use-after-free in cachefiles_withdraw_cookie() We got the following issue in our fault injection stress test: ================================================================== BUG: KASAN: slab-use-after-free in cachefiles_withdraw_cookie+0x4d9/0x600 Read of size 8 at addr ffff888118efc000 by task kworker/u78:0/109 CPU: 13 PID: 109 Comm: kworker/u78:0 Not tainted 6.8.0-dirty #566 Call Trace: <TASK> kasan_report+0x93/0xc0 cachefiles_withdraw_cookie+0x4d9/0x600 fscache_cookie_state_machine+0x5c8/0x1230 fscache_cookie_worker+0x91/0x1c0 process_one_work+0x7fa/0x1800 [...] Allocated by task 117: kmalloc_trace+0x1b3/0x3c0 cachefiles_acquire_volume+0xf3/0x9c0 fscache_create_volume_work+0x97/0x150 process_one_work+0x7fa/0x1800 [...] Freed by task 120301: kfree+0xf1/0x2c0 cachefiles_withdraw_cache+0x3fa/0x920 cachefiles_put_unbind_pincount+0x1f6/0x250 cachefiles_daemon_release+0x13b/0x290 __fput+0x204/0xa00 task_work_run+0x139/0x230 do_exit+0x87a/0x29b0 [...] ================================================================== Following is the process that triggers the issue: p1 | p2 ------------------------------------------------------------ fscache_begin_lookup fscache_begin_volume_access fscache_cache_is_live(fscache_cache) cachefiles_daemon_release cachefiles_put_unbind_pincount cachefiles_daemon_unbind cachefiles_withdraw_cache fscache_withdraw_cache fscache_set_cache_state(cache, FSCACHE_CACHE_IS_WITHDRAWN); cachefiles_withdraw_objects(cache) fscache_wait_for_objects(fscache) atomic_read(&fscache_cache->object_count) == 0 fscache_perform_lookup cachefiles_lookup_cookie cachefiles_alloc_object refcount_set(&object->ref, 1); object->volume = volume fscache_count_object(vcookie->cache); atomic_inc(&fscache_cache->object_count) cachefiles_withdraw_volumes cachefiles_withdraw_volume fscache_withdraw_volume __cachefiles_free_volume kfree(cachefiles_volume) fscache_cookie_state_machine cachefiles_withdraw_cookie cache = object->volume->cache; // cachefiles_volume UAF !!! After setting FSCACHE_CACHE_IS_WITHDRAWN, wait for all the cookie lookups to complete first, and then wait for fscache_cache->object_count == 0 to avoid the cookie exiting after the volume has been freed and triggering the above issue. Therefore call fscache_withdraw_volume() before calling cachefiles_withdraw_objects(). This way, after setting FSCACHE_CACHE_IS_WITHDRAWN, only the following two cases will occur: 1) fscache_begin_lookup fails in fscache_begin_volume_access(). 2) fscache_withdraw_volume() will ensure that fscache_count_object() has been executed before calling fscache_wait_for_objects().

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

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CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  7.8 HIGH

Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://git.kernel.org/stable/c/5d8f805789072ea7fd39504694b7bd17e5f751c4	Patch
https://git.kernel.org/stable/c/5d8f805789072ea7fd39504694b7bd17e5f751c4	Patch
https://git.kernel.org/stable/c/8de253177112a47c9af157d23ae934779188b4e1	Patch
https://git.kernel.org/stable/c/8de253177112a47c9af157d23ae934779188b4e1	Patch
https://git.kernel.org/stable/c/9e67589a4a7b7e5660b524d1d5fe61242bcbcc11	Patch
https://git.kernel.org/stable/c/9e67589a4a7b7e5660b524d1d5fe61242bcbcc11	Patch
https://git.kernel.org/stable/c/ef81340401e8a371d6b17f69e76d861920972cfe	Patch
https://git.kernel.org/stable/c/ef81340401e8a371d6b17f69e76d861920972cfe	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	NIST

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Change History

3 change records found show changes

CVE Modified by CVE 11/21/2024 4:32:09 AM

Action	Type	Old Value	New Value
Added	Reference		https://git.kernel.org/stable/c/5d8f805789072ea7fd39504694b7bd17e5f751c4
Added	Reference		https://git.kernel.org/stable/c/8de253177112a47c9af157d23ae934779188b4e1
Added	Reference		https://git.kernel.org/stable/c/9e67589a4a7b7e5660b524d1d5fe61242bcbcc11
Added	Reference		https://git.kernel.org/stable/c/ef81340401e8a371d6b17f69e76d861920972cfe

Initial Analysis by NIST 8/22/2024 9:38:03 AM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-416
Added	CPE Configuration		OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.17 up to (excluding) 6.1.101 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.42 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.9.11
Changed	Reference Type	https://git.kernel.org/stable/c/5d8f805789072ea7fd39504694b7bd17e5f751c4 No Types Assigned	https://git.kernel.org/stable/c/5d8f805789072ea7fd39504694b7bd17e5f751c4 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/8de253177112a47c9af157d23ae934779188b4e1 No Types Assigned	https://git.kernel.org/stable/c/8de253177112a47c9af157d23ae934779188b4e1 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/9e67589a4a7b7e5660b524d1d5fe61242bcbcc11 No Types Assigned	https://git.kernel.org/stable/c/9e67589a4a7b7e5660b524d1d5fe61242bcbcc11 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/ef81340401e8a371d6b17f69e76d861920972cfe No Types Assigned	https://git.kernel.org/stable/c/ef81340401e8a371d6b17f69e76d861920972cfe Patch

New CVE Received from kernel.org 7/29/2024 11:15:13 AM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 3265 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix slab-use-after-free in cachefiles_withdraw_cookie() We got the following issue in our fault injection stress test: ================================================================== BUG: KASAN: slab-use-after-free in cachefiles_withdraw_cookie+0x4d9/0x600 Read of size 8 at addr ffff888118efc000 by task kworker/u78:0/109 CPU: 13 PID: 109 Comm: kworker/u78:0 Not tainted 6.8.0-dirty #566 Call Trace: <TASK> kas
Added	Reference		kernel.org https://git.kernel.org/stable/c/5d8f805789072ea7fd39504694b7bd17e5f751c4 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/8de253177112a47c9af157d23ae934779188b4e1 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/9e67589a4a7b7e5660b524d1d5fe61242bcbcc11 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/ef81340401e8a371d6b17f69e76d861920972cfe [No types assigned]