CVE-2022-50656 - nfc: pn533: Clear nfc_target before being used

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HIGH

nfc: pn533: Clear nfc_target before being used

Published Dec 9, 2025

8.1

HIGH

CVSS 3.1

EPSS 0.34%

Description

Fix a slab-out-of-bounds read that occurs in nla_put() called from nfc_genl_send_target() when target->sensb_res_len, which is duplicated from an nfc_target in pn533, is too large as the nfc_target is not properly initialized and retains garbage values. Clear nfc_targets with memset() before they are used.

Found by a modified version of syzkaller.

BUG: KASAN: slab-out-of-bounds in nla_put Call Trace: memcpy nla_put nfc_genl_dump_targets genl_lock_dumpit netlink_dump __netlink_dump_start genl_family_rcv_msg_dumpit genl_rcv_msg netlink_rcv_skb genl_rcv netlink_unicast netlink_sendmsg sock_sendmsg ____sys_sendmsg ___sys_sendmsg __sys_sendmsg do_syscall_64

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
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
Vendor Linux Product Linux Default
affected
- Version
  3.3
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <3.3
- Version
  4.14.303
  Status
  unaffected
  Constraints
  <=4.14.*
- Version
  4.19.270
  Status
  unaffected
  Constraints
  <=4.19.*
- Version
  4.9.337
  Status
  unaffected
  Constraints
  <=4.9.*
- Version
  5.10.163
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.15.86
  Status
  unaffected
  Constraints
  <=5.15.*
- Version
  5.4.229
  Status
  unaffected
  Constraints
  <=5.4.*
- Version
  6.0.16
  Status
  unaffected
  Constraints
  <=6.0.*
- Version
  6.1.2
  Status
  unaffected
  Constraints
  <=6.1.*
- Version
  6.2
  Status
  unaffected
  Constraints
  <=*

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
	affected
	affected

Linux

affected

Version	Status	Constraints
3.3	affected	-
0	unaffected	<3.3
4.14.303	unaffected	<=4.14.*
4.19.270	unaffected	<=4.19.*
4.9.337	unaffected	<=4.9.*
5.10.163	unaffected	<=5.10.*
5.15.86	unaffected	<=5.15.*
5.4.229	unaffected	<=5.4.*
6.0.16	unaffected	<=6.0.*
6.1.2	unaffected	<=6.1.*
6.2	unaffected	<=*

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

Not affected
Red Hat Enterprise Linux 9

kernel-rt

Not affected

Product	Package	State	Advisory
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	Not affected	n/a
Red Hat Enterprise Linux 9	kernel-rt	Not affected	n/a

Remediation

No remediation recorded yet.

Weaknesses (0)

No CWE recorded.

References (15)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2022-50656		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2420230		Issue Tracking
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-55700		Advisory
https://git.kernel.org/stable/c/61a7e15d55fae329a245535c3bac494e401005b8
https://git.kernel.org/stable/c/755019e37815a66bb0a23893debbd3dd640ccbd3
https://git.kernel.org/stable/c/8bddef54cbe9ede5ac7478f1e1e968fcfe7e6f03
https://git.kernel.org/stable/c/9da4a0411f3455e3885831d0758bee3e3d565bbc
https://git.kernel.org/stable/c/9f28157778ede0d4f183f7ab3b46995bb400abbe
https://git.kernel.org/stable/c/aae9c24ebd901f482e6c88b6f9e0c80dc5b536d6
https://git.kernel.org/stable/c/aea9e64dec2cc6cd742e07ecd4e6236fc76b389b
https://git.kernel.org/stable/c/bef2f478513e7367ef3b05441f6afca981de29be
https://git.kernel.org/stable/c/e491285b4d08884b622638be8e4961eb43b0af64
https://lore.kernel.org/linux-cve-announce/2025120938-CVE-2022-50656-4655@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-50656
https://www.cve.org/CVERecord?id=CVE-2022-50656