CVE-2022-49688 - afs: Fix dynamic root getattr

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MEDIUM

afs: Fix dynamic root getattr

Published Feb 26, 2025

5.5

MEDIUM

CVSS 3.1

EPSS 0.30%

Description

The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd.

Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr().

This can be tested by stat'ing a directory in /afs. It may be sufficient just to do "ls /afs" and the oops looks something like:

BUG: kernel NULL pointer dereference, address: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Call Trace: <TASK> vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
  -
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
Vendor Linux Product Linux Default
unaffected
- Version
  4.19.245
  Status
  affected
  Constraints
  <4.19.250
- Version
  5.10.118
  Status
  affected
  Constraints
  <5.10.127
- Version
  5.15.42
  Status
  affected
  Constraints
  <5.15.51
- Version
  5.17.10
  Status
  affected
  Constraints
  <5.18
- Version
  5.4.196
  Status
  affected
  Constraints
  <5.4.202
Vendor Linux Product Linux Default
affected
- Version
  5.18
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <5.18
- Version
  4.19.250
  Status
  unaffected
  Constraints
  <=4.19.*
- Version
  5.10.127
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.15.51
  Status
  unaffected
  Constraints
  <=5.15.*
- Version
  5.18.8
  Status
  unaffected
  Constraints
  <=5.18.*
- Version
  5.19
  Status
  unaffected
  Constraints
  <=*
- Version
  5.4.202
  Status
  unaffected
  Constraints
  <=5.4.*

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Linux

unaffected

Version	Status	Constraints
	affected
	affected
	affected
	affected
	affected	-
	affected
	affected

Linux

unaffected

Version	Status	Constraints
4.19.245	affected	<4.19.250
5.10.118	affected	<5.10.127
5.15.42	affected	<5.15.51
5.17.10	affected	<5.18
5.4.196	affected	<5.4.202

Linux

affected

Version	Status	Constraints
5.18	affected	-
0	unaffected	<5.18
4.19.250	unaffected	<=4.19.*
5.10.127	unaffected	<=5.10.*
5.15.51	unaffected	<=5.15.*
5.18.8	unaffected	<=5.18.*
5.19	unaffected	<=*
5.4.202	unaffected	<=5.4.*

Red Hat Enterprise Linux 9

kernel-0:5.14.0-284.11.1.el9_2

Fixed · RHSA-2023:2458
Red Hat Enterprise Linux 9

kernel-0:5.14.0-284.11.1.el9_2

Fixed · RHSA-2023:2458
Red Hat Enterprise Linux 10

kernel

Not affected
Red Hat Enterprise Linux 6

kernel

Not affected
Red Hat Enterprise Linux 7

kernel

Not affected
Red Hat Enterprise Linux 7

kernel-rt

Not affected
Red Hat Enterprise Linux 8

kernel

Not affected
Red Hat Enterprise Linux 8

kernel-rt

Not affected
Red Hat Enterprise Linux 9

kernel-rt

Fix deferred

Product	Package	State	Advisory
Red Hat Enterprise Linux 9	kernel-0:5.14.0-284.11.1.el9_2	Fixed	RHSA-2023:2458
Red Hat Enterprise Linux 9	kernel-0:5.14.0-284.11.1.el9_2	Fixed	RHSA-2023:2458
Red Hat Enterprise Linux 10	kernel	Not affected	n/a
Red Hat Enterprise Linux 6	kernel	Not affected	n/a
Red Hat Enterprise Linux 7	kernel	Not affected	n/a
Red Hat Enterprise Linux 7	kernel-rt	Not affected	n/a
Red Hat Enterprise Linux 8	kernel	Not affected	n/a
Red Hat Enterprise Linux 8	kernel-rt	Not affected	n/a
Red Hat Enterprise Linux 9	kernel-rt	Fix deferred	n/a

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-476

NULL Pointer Dereference

References (11)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2022-49688		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2347700		Issue Tracking
https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83ce		Patch
https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4d		Patch
https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9b		Patch
https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4		Patch
https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3deb		Patch
https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192b		Patch
https://lore.kernel.org/linux-cve-announce/2025022627-CVE-2022-49688-5c71@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-49688
https://www.cve.org/CVERecord?id=CVE-2022-49688