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libssh2: fix CVE-2026-58051

Message ID 20260901103937.1630469-1-Ghanshyam.BanaitSanjay@windriver.com
State Under Review
Headers show
Series libssh2: fix CVE-2026-58051 | expand

Commit Message

Ghanshyam Banait Sept. 1, 2026, 10:39 a.m. UTC 
libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them,
so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry.
A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized,
attacker-influenceable attrs pointer in a connecting libssh2 client.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-58051

Backport the patch to fix CVE-2026-58051.
https://github.com/libssh2/libssh2/commit/a9758da45a52bc8c630ec9493804d0c6ea30b24a

Signed-off-by: Ghanshyam Banait <Ghanshyam.BanaitSanjay@windriver.com>
---
 .../libssh2/libssh2/CVE-2026-58051.patch      | 34 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 35 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-58051.patch
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Patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-58051.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-58051.patch
new file mode 100644
index 0000000000..20f454a304
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-58051.patch
@@ -0,0 +1,34 @@ 
+From a9758da45a52bc8c630ec9493804d0c6ea30b24a Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <vszakats@users.noreply.github.com>
+Date: Mon, 29 Jun 2026 19:12:21 +0200
+Subject: [PATCH] publickey: fix potential arbitrary free in
+ `libssh2_publickey_list_fetch()` (#2127)
+
+Due to uninitialized list entry.
+
+Reported-and-patch-by: Behzod Abdullayev
+Reported-by: Sharique Raza
+
+Follow-up to e15f5d97a04cc676ce117dd324fef85b046207a9
+
+CVE: CVE-2026-58051
+
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/a9758da45a52bc8c630ec9493804d0c6ea30b24a]
+
+Signed-off-by: Ghanshyam Banait <Ghanshyam.BanaitSanjay@windriver.com>
+---
+ src/publickey.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/publickey.c b/src/publickey.c
+index b7f384310e..a0d3100005 100644
+--- a/src/publickey.c
++++ b/src/publickey.c
+@@ -905,6 +905,7 @@ int libssh2_publickey_list_fetch(LIBSSH2_PUBLICKEY *pkey,
+                     goto err_exit;
+                 }
+                 list = newlist;
++                memset(&list[keys], 0, sizeof(list[keys]));
+             }
+             if(pkey->version == 1) {
+                 unsigned long comment_len;
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index e8fa4a5eec..c579749dc3 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -21,6 +21,7 @@  SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2026-66034.patch \
            file://CVE-2026-66035.patch \
            file://CVE-2026-58050.patch \
+           file://CVE-2026-58051.patch \
 	   "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"