From: Ankur Tyagi <[email protected]> Details https://nvd.nist.gov/vuln/detail/CVE-2026-24401
Signed-off-by: Ankur Tyagi <[email protected]> --- meta/recipes-connectivity/avahi/avahi_0.8.bb | 1 + .../avahi/files/CVE-2026-24401.patch | 74 +++++++++++++++++++ 2 files changed, 75 insertions(+) create mode 100644 meta/recipes-connectivity/avahi/files/CVE-2026-24401.patch diff --git a/meta/recipes-connectivity/avahi/avahi_0.8.bb b/meta/recipes-connectivity/avahi/avahi_0.8.bb index bb20fd17cc..bf93e4c7b9 100644 --- a/meta/recipes-connectivity/avahi/avahi_0.8.bb +++ b/meta/recipes-connectivity/avahi/avahi_0.8.bb @@ -38,6 +38,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/avahi-${PV}.tar.gz \ file://CVE-2024-52616.patch \ file://CVE-2024-52615.patch \ file://CVE-2025-68276.patch \ + file://CVE-2026-24401.patch \ " GITHUB_BASE_URI = "https://github.com/avahi/avahi/releases/"; diff --git a/meta/recipes-connectivity/avahi/files/CVE-2026-24401.patch b/meta/recipes-connectivity/avahi/files/CVE-2026-24401.patch new file mode 100644 index 0000000000..47efbdd70c --- /dev/null +++ b/meta/recipes-connectivity/avahi/files/CVE-2026-24401.patch @@ -0,0 +1,74 @@ +From 5eea2640324928c15936b7a2bcbf8ea0de7b08f7 Mon Sep 17 00:00:00 2001 +From: Hugo Muis <[email protected]> +Date: Sun, 2 Mar 2025 18:06:24 +0100 +Subject: [PATCH] core: fix uncontrolled recursion bug using a simple loop + detection algorithm + +Closes https://github.com/avahi/avahi/issues/501 + +CVE: CVE-2025-68468 +Upstream-Status: Backport [https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524] +(cherry picked from commit 78eab31128479f06e30beb8c1cbf99dd921e2524) +Signed-off-by: Ankur Tyagi <[email protected]> +--- + avahi-core/browse.c | 40 ++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 40 insertions(+) + +diff --git a/avahi-core/browse.c b/avahi-core/browse.c +index f461083..975b3e9 100644 +--- a/avahi-core/browse.c ++++ b/avahi-core/browse.c +@@ -401,6 +401,40 @@ static int lookup_go(AvahiSRBLookup *l) { + return n; + } + ++static int lookup_exists_in_path(AvahiSRBLookup* lookup, AvahiSRBLookup* from, AvahiSRBLookup* to) { ++ AvahiRList* rl; ++ if (from == to) ++ return 0; ++ for (rl = from->cname_lookups; rl; rl = rl->rlist_next) { ++ int r = lookup_exists_in_path(lookup, rl->data, to); ++ if (r == 1) { ++ /* loop detected, propagate result */ ++ return r; ++ } else if (r == 0) { ++ /* is loop detected? */ ++ return lookup == from; ++ } else { ++ /* `to` not found, continue */ ++ continue; ++ } ++ } ++ /* no path found */ ++ return -1; ++} ++ ++static int cname_would_create_loop(AvahiSRBLookup* l, AvahiSRBLookup* n) { ++ int ret; ++ if (l == n) ++ /* Loop to self */ ++ return 1; ++ ++ ret = lookup_exists_in_path(n, l->record_browser->root_lookup, l); ++ ++ /* Path to n always exists */ ++ assert(ret != -1); ++ return ret; ++} ++ + static void lookup_handle_cname(AvahiSRBLookup *l, AvahiIfIndex interface, AvahiProtocol protocol, AvahiLookupFlags flags, AvahiRecord *r) { + AvahiKey *k; + AvahiSRBLookup *n; +@@ -420,6 +454,12 @@ static void lookup_handle_cname(AvahiSRBLookup *l, AvahiIfIndex interface, Avahi + return; + } + ++ if (cname_would_create_loop(l, n)) { ++ /* CNAME loops are not allowed */ ++ lookup_unref(n); ++ return; ++ } ++ + l->cname_lookups = avahi_rlist_prepend(l->cname_lookups, lookup_ref(n)); + + lookup_go(n);
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