linux-cve-announce - CVE-2022-50497: binfmt_misc: fix shift-out-of-bounds in check_special

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Message-ID: <2025100419-CVE-2022-50497-0aee@gregkh>
Date: Sat,  4 Oct 2025 17:51:22 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50497: binfmt_misc: fix shift-out-of-bounds in check_special_flags

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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

binfmt_misc: fix shift-out-of-bounds in check_special_flags

UBSAN reported a shift-out-of-bounds warning:

 left shift of 1 by 31 places cannot be represented in type 'int'
 Call Trace:
  <TASK>
  __dump_stack lib/dump_stack.c:88 [inline]
  dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
  ubsan_epilogue+0xa/0x44 lib/ubsan.c:151
  __ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322
  check_special_flags fs/binfmt_misc.c:241 [inline]
  create_entry fs/binfmt_misc.c:456 [inline]
  bm_register_write+0x9d3/0xa20 fs/binfmt_misc.c:654
  vfs_write+0x11e/0x580 fs/read_write.c:582
  ksys_write+0xcf/0x120 fs/read_write.c:637
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x63/0xcd
 RIP: 0033:0x4194e1

Since the type of Node's flags is unsigned long, we should define these
macros with same type too.

The Linux kernel CVE team has assigned CVE-2022-50497 to this issue.


Affected and fixed versions
===========================

	Fixed in 4.9.337 with commit 0f1a48994b3e516d5c7fd5d12204fdba7a604771
	Fixed in 4.14.303 with commit ea6145370be8016755c43aca799815fc4b8c88b1
	Fixed in 4.19.270 with commit 97382a2639b1cd9631f6069061e9d7062cd2b098
	Fixed in 5.4.229 with commit 419b808504c26b3e3342365f34ccd0843e09a7f8
	Fixed in 5.10.163 with commit dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8
	Fixed in 5.15.86 with commit 88cea1676a09f7c45a1438153a126610c33b1590
	Fixed in 6.0.16 with commit a651bb5ff997b9f02662bcdef3d8b4e6f0d79656
	Fixed in 6.1.2 with commit a91123d4bda463469f68f0427adabf8108001f94
	Fixed in 6.2 with commit 6a46bf558803dd2b959ca7435a5c143efe837217

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-50497
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/binfmt_misc.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/0f1a48994b3e516d5c7fd5d12204fdba7a604771
	https://git.kernel.org/stable/c/ea6145370be8016755c43aca799815fc4b8c88b1
	https://git.kernel.org/stable/c/97382a2639b1cd9631f6069061e9d7062cd2b098
	https://git.kernel.org/stable/c/419b808504c26b3e3342365f34ccd0843e09a7f8
	https://git.kernel.org/stable/c/dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8
	https://git.kernel.org/stable/c/88cea1676a09f7c45a1438153a126610c33b1590
	https://git.kernel.org/stable/c/a651bb5ff997b9f02662bcdef3d8b4e6f0d79656
	https://git.kernel.org/stable/c/a91123d4bda463469f68f0427adabf8108001f94
	https://git.kernel.org/stable/c/6a46bf558803dd2b959ca7435a5c143efe837217