CVE-2024-41057

Source
https://nvd.nist.gov/vuln/detail/CVE-2024-41057
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-41057.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-41057
Related
Published
2024-07-29T15:15:13Z
Modified
2024-09-18T03:26:32.599445Z
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
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

cachefiles: fix slab-use-after-free in cachefileswithdrawcookie()

We got the following issue in our fault injection stress test:

================================================================== BUG: KASAN: slab-use-after-free in cachefileswithdrawcookie+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> kasanreport+0x93/0xc0 cachefileswithdrawcookie+0x4d9/0x600 fscachecookiestatemachine+0x5c8/0x1230 fscachecookieworker+0x91/0x1c0 processonework+0x7fa/0x1800 [...]

Allocated by task 117: kmalloctrace+0x1b3/0x3c0 cachefilesacquirevolume+0xf3/0x9c0 fscachecreatevolumework+0x97/0x150 processonework+0x7fa/0x1800 [...]

Freed by task 120301: kfree+0xf1/0x2c0 cachefileswithdrawcache+0x3fa/0x920 cachefilesputunbindpincount+0x1f6/0x250 cachefilesdaemonrelease+0x13b/0x290 _fput+0x204/0xa00 taskworkrun+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)

cachefilesdaemonrelease cachefilesputunbindpincount cachefilesdaemonunbind cachefileswithdrawcache fscachewithdrawcache fscachesetcachestate(cache, FSCACHECACHEISWITHDRAWN); cachefileswithdrawobjects(cache) fscachewaitforobjects(fscache) atomicread(&fscachecache->objectcount) == 0 fscacheperformlookup cachefileslookupcookie cachefilesallocobject refcountset(&object->ref, 1); object->volume = volume fscachecountobject(vcookie->cache); atomicinc(&fscachecache->objectcount) cachefileswithdrawvolumes cachefileswithdrawvolume fscachewithdrawvolume _cachefilesfreevolume kfree(cachefilesvolume) fscachecookiestatemachine cachefileswithdrawcookie cache = object->volume->cache; // cachefiles_volume UAF !!!

After setting FSCACHECACHEISWITHDRAWN, wait for all the cookie lookups to complete first, and then wait for fscachecache->objectcount == 0 to avoid the cookie exiting after the volume has been freed and triggering the above issue. Therefore call fscachewithdrawvolume() before calling cachefileswithdraw_objects().

This way, after setting FSCACHECACHEISWITHDRAWN, only the following two cases will occur: 1) fscachebeginlookup fails in fscachebeginvolumeaccess(). 2) fscachewithdrawvolume() will ensure that fscachecountobject() has been executed before calling fscachewaitfor_objects().

References

Affected packages

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.106-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.9.11-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1
6.6.8-1
6.6.9-1
6.6.11-1
6.6.13-1~bpo12+1
6.6.13-1
6.6.15-1
6.6.15-2
6.7-1~exp1
6.7.1-1~exp1
6.7.4-1~exp1
6.7.7-1
6.7.9-1
6.7.9-2
6.7.12-1~bpo12+1
6.7.12-1
6.8.9-1
6.8.11-1
6.8.12-1~bpo12+1
6.8.12-1
6.9.2-1~exp1
6.9.7-1~bpo12+1
6.9.7-1
6.9.8-1
6.9.9-1
6.9.10-1~bpo12+1
6.9.10-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}