cbcvebase.
CVE-2023-53369
published 2025-09-18

CVE-2023-53369: In the Linux kernel, the following vulnerability has been resolved: net: dcb: choose correct policy to parse DCB_ATTR_BCN The dcbnl_bcn_setcfg uses erroneous…

PriorityP422medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.16%
5.7th percentile
In the Linux kernel, the following vulnerability has been resolved: net: dcb: choose correct policy to parse DCB_ATTR_BCN The dcbnl_bcn_setcfg uses erroneous policy to parse tb[DCB_ATTR_BCN], which is introduced in commit 859ee3c43812 ("DCB: Add support for DCB BCN"). Please see the comment in below code static int dcbnl_bcn_setcfg(...) { ... ret = nla_parse_nested_deprecated(..., dcbnl_pfc_up_nest, .. ) // !!! dcbnl_pfc_up_nest for attributes // DCB_PFC_UP_ATTR_0 to DCB_PFC_UP_ATTR_ALL in enum dcbnl_pfc_up_attrs ... for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) { // !!! DCB_BCN_ATTR_RP_0 to DCB_BCN_ATTR_RP_7 in enum dcbnl_bcn_attrs ... value_byte = nla_get_u8(data[i]); ... } ... for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) { // !!! DCB_BCN_ATTR_BCNA_0 to DCB_BCN_ATTR_RI in enum dcbnl_bcn_attrs ... value_int = nla_get_u32(data[i]); ... } ... } That is, the nla_parse_nested_deprecated uses dcbnl_pfc_up_nest attributes to parse nlattr defined in dcbnl_pfc_up_attrs. But the following access code fetch each nlattr as dcbnl_bcn_attrs attributes. By looking up the associated nla_policy for dcbnl_bcn_attrs. We can find the beginning part of these two policies are "same". static const struct nla_policy dcbnl_pfc_up_nest[...] = { [DCB_PFC_UP_ATTR_0] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_1] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_2] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_3] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_4] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_5] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_6] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_7] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG}, }; static const struct nla_policy dcbnl_bcn_nest[...] = { [DCB_BCN_ATTR_RP_0] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_1] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_2] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_3] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_4] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_5] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_6] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_7] = {.type

Affected

18 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.52-1 (bookworm)linux 6.1.52-1 (bookworm)
linuxlinux——
linuxlinux>= 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e < 5b3dbedb8d4a0f9f7ce904d76b885438af2a21f95b3dbedb8d4a0f9f7ce904d76b885438af2a21f9
linuxlinux>= 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e < 8e309f43d0ca4051d20736c06a6f84bbddd881da8e309f43d0ca4051d20736c06a6f84bbddd881da
linuxlinux>= 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e < a0da2684db18dead3bcee12fb185e596e3d63c2ba0da2684db18dead3bcee12fb185e596e3d63c2b
linuxlinux>= 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e < ecff20e193207b44fdbfe64d7de89890f0a7fe6cecff20e193207b44fdbfe64d7de89890f0a7fe6c
linuxlinux>= 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e < 199fde04bd875d28b3a5ca525eaaa004eec6e947199fde04bd875d28b3a5ca525eaaa004eec6e947
linuxlinux>= 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e < 31d49ba033095f6e8158c60f69714a500922e0c331d49ba033095f6e8158c60f69714a500922e0c3
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.191-15.10.191-1
linuxlinux_kernel>= 0 < 6.1.52-16.1.52-1
linuxlinux_kernel>= 0 < 6.4.11-16.4.11-1
linuxlinux_kernel>= 0 < 6.4.11-16.4.11-1
linuxlinux_kernel>= 2.6.29 < 5.4.2535.4.253
linuxlinux_kernel>= 5.11 < 5.15.1265.15.126
linuxlinux_kernel>= 5.16 < 6.1.456.1.45
linuxlinux_kernel>= 5.5 < 5.10.1905.10.190
linuxlinux_kernel>= 6.2 < 6.4.106.4.10

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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