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gnutls: fix CVE-2026-3833

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Backport patch to fix CVE-2026-3833.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2026-3833

Upstream fix:
  https://gitlab.com/gnutls/gnutls/-/commit/19f6508647bdcd3ce21130201e484d7ca6d962c5

Tested with ptest:
Before: PASSED: 369, FAILED: 0, SKIPPED: 17
After: PASSED: 369, FAILED: 0, SKIPPED: 17

(From OE-Core rev: c4d9e204adc134b1d7d2b3b8ea9bbfd6fd33e5f5)

Signed-off-by: Adarsh Jagadish Kamini <adarsh.jagadish.kamini@est.tech>
Signed-off-by: Fabien Thomas <fabien.thomas@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
This commit is contained in:
Adarsh Jagadish Kamini authored and Paul Barker committed 2026-08-24 11:43:44 +01:00
1 parent 6c3ab4e59e
commit 524a237691
2 files changed
+91
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meta/recipes-support/gnutls/gnutls/CVE-2026-3833.patch
+90
View File
@@ -0,0 +1,90 @@
From 47f495820c5c049933563e869e931a2180e0a428 Mon Sep 17 00:00:00 2001
From: Alexander Sosedkin <asosedkin@redhat.com>
Date: Mon, 16 Mar 2026 15:29:40 +0100
Subject: [PATCH] x509/name-constraints: compare domain names case-insensitive
RFC 5280 7.2:
> When comparing DNS names for equality, conforming implementations
> MUST perform a case-insensitive exact match on the entire DNS name.
> When evaluating name constraints, conforming implementations MUST
> perform a case-insensitive exact match on a label-by-label basis.
Domain name comparison during name constraints processing
was case-sensitive. For excluded name constraints, this could lead to
incorrectly accepting domain names that should've been rejected.
The code for comparing domain names and domain name parts of emails
has been modified to perform case-insensitive comparison instead.
Reported-by: Oleh Konko <security@1seal.org>
Reported-by: Joshua Rogers of AISLE Research Team <joshua@joshua.hu>
Fixes: #1223
Fixes: #1803
Fixes: #1852
Fixes: CVE-2026-3833
Fixes: GNUTLS-SA-2026-04-29-5
CVSS: 7.4 High CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Signed-off-by: Alexander Sosedkin <asosedkin@redhat.com>
CVE: CVE-2026-3833
Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/19f6508647bdcd3ce21130201e484d7ca6d962c5]
Signed-off-by: Adarsh Jagadish Kamini <adarsh.jagadish.kamini@est.tech>
---
lib/x509/name_constraints.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/lib/x509/name_constraints.c b/lib/x509/name_constraints.c
index 04722bdf4..dee045d25 100644
--- a/lib/x509/name_constraints.c
+++ b/lib/x509/name_constraints.c
@@ -35,6 +35,7 @@
#include "x509_int.h"
#include "x509_ext_int.h"
#include <libtasn1.h>
+#include "c-strcase.h"
#include "ip.h"
#include "ip-in-cidr.h"
@@ -80,7 +81,7 @@ enum name_constraint_relation {
NC_SORTS_AFTER = 2 /* unrelated constraints */
};
-/* A helper to compare just a pair of strings with this rich comparison */
+/* Helpers to compare just a pair of strings with this rich comparison */
static enum name_constraint_relation
compare_strings(const void *n1, size_t n1_len, const void *n2, size_t n2_len)
{
@@ -96,6 +97,22 @@ compare_strings(const void *n1, size_t n1_len, const void *n2, size_t n2_len)
return NC_EQUAL;
}
+static enum name_constraint_relation
+compare_strings_case_insensitive(const void *n1, size_t n1_len, const void *n2,
+ size_t n2_len)
+{
+ int r = c_strncasecmp(n1, n2, MIN(n1_len, n2_len));
+ if (r < 0)
+ return NC_SORTS_BEFORE;
+ if (r > 0)
+ return NC_SORTS_AFTER;
+ if (n1_len < n2_len)
+ return NC_SORTS_BEFORE;
+ if (n1_len > n2_len)
+ return NC_SORTS_AFTER;
+ return NC_EQUAL;
+}
+
/* Rich-compare DNS names. Example order/relationships:
* z.x.a INCLUDED_BY x.a BEFORE y.a INCLUDED_BY a BEFORE x.b BEFORE y.b */
static enum name_constraint_relation compare_dns_names(const gnutls_datum_t *n1,
@@ -121,8 +138,8 @@ static enum name_constraint_relation compare_dns_names(const gnutls_datum_t *n1,
while (j && n2->data[j - 1] != '.')
j--;
- rel = compare_strings(&n1->data[i], i_end - i, &n2->data[j],
- j_end - j);
+ rel = compare_strings_case_insensitive(&n1->data[i], i_end - i,
+ &n2->data[j], j_end - j);
if (rel == NC_SORTS_BEFORE) /* x.a BEFORE y.a */
return NC_SORTS_BEFORE;
if (rel == NC_SORTS_AFTER) /* y.a AFTER x.a */
meta/recipes-support/gnutls/gnutls_3.8.4.bb
+1
View File
@@ -45,6 +45,7 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar
file://CVE-2025-14831-9.patch \
file://CVE-2026-42009_p1.patch \
file://CVE-2026-42009_p2.patch \
file://CVE-2026-3833.patch \
"
SRC_URI[sha256sum] = "2bea4e154794f3f00180fa2a5c51fe8b005ac7a31cd58bd44cdfa7f36ebc3a9b"