CVE-2022-49152

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Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49152
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49152.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-49152
Downstream
Published
2025-02-26T01:55:18Z
Modified
2025-10-21T08:57:16.962109Z
Summary
XArray: Fix xas_create_range() when multi-order entry present
Details

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

XArray: Fix xascreaterange() when multi-order entry present

If there is already an entry present that is of order >= XACHUNKSHIFT when we call xascreaterange(), xascreaterange() will misinterpret that entry as a node and dereference xa_node->parent, generally leading to a crash that looks something like this:

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 32 Comm: khugepaged Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0 RIP: 0010:xaparentlocked include/linux/xarray.h:1207 [inline] RIP: 0010:xascreaterange+0x2d9/0x6e0 lib/xarray.c:725

It's deterministically reproducable once you know what the problem is, but producing it in a live kernel requires khugepaged to hit a race. While the problem has been present since xascreaterange() was introduced, I'm not aware of a way to hit it before the page cache was converted to use multi-index entries.

References

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
Introduced
6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3
Fixed
18f13edf3424b3b61814b69d5269b2e14584800c
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3
Fixed
3e3c658055c002900982513e289398a1aad4a488

Affected versions

v5.*

v5.16
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.17
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.17.1

Database specific

vanir_signatures

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]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.17.0
Fixed
5.17.2