CVE-2026-52967: smb/client: fix possible infinite loop and oob read in symlink_data()

CVE-2026-52967: smb/client: fix possible infinite loop and oob read in symlink_data()

[Greg Kroah-Hartman]

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

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

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

smb/client: fix possible infinite loop and oob read in symlink_data()

On 32-bit architectures, the infinite loop is as follows:

  len = p->ErrorDataLength == 0xfffffff8
  u8 *next = p->ErrorContextData + len
  next == p

On 32-bit architectures, the out-of-bounds read is as follows:

  len = p->ErrorDataLength == 0xfffffff0
  u8 *next = p->ErrorContextData + len
  next == (u8 *)p - 8

The Linux kernel CVE team has assigned CVE-2026-52967 to this issue.


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

	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.1.175 with commit 1cfa2d59f669db28d6292d10ff87ca6837c781b0
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.6.141 with commit b41598bf54b3fe528994e573df6008f8f4d0a4f4
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.12.91 with commit cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.18.33 with commit 97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 7.0.10 with commit 1b9331b16b0ed9414dcf7583d8134bdfeb117aae
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 7.1 with commit 7d9a7f1f96cd617ee9e75bb22217c709038e26b8
	Issue introduced in 6.0.16 with commit 2d046892a493d9760c35fdaefc3017f27f91b621

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-2026-52967
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/smb/client/smb2file.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/1cfa2d59f669db28d6292d10ff87ca6837c781b0
	https://git.kernel.org/stable/c/b41598bf54b3fe528994e573df6008f8f4d0a4f4
	https://git.kernel.org/stable/c/cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23
	https://git.kernel.org/stable/c/97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb
	https://git.kernel.org/stable/c/1b9331b16b0ed9414dcf7583d8134bdfeb117aae
	https://git.kernel.org/stable/c/7d9a7f1f96cd617ee9e75bb22217c709038e26b8