CVE-2023-52906: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_mpls: Fix warning during failed attribute validation The 'TCA_MPLS_LABEL'…

PriorityP338high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.25%

16.3th percentile

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_mpls: Fix warning during failed attribute validation The 'TCA_MPLS_LABEL' attribute is of 'NLA_U32' type, but has a validation type of 'NLA_VALIDATE_FUNCTION'. This is an invalid combination according to the comment above 'struct nla_policy': " Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: NLA_BINARY Validation function called for the attribute. All other Unused - but note that it's a union " This can trigger the warning [1] in nla_get_range_unsigned() when validation of the attribute fails. Despite being of 'NLA_U32' type, the associated 'min'/'max' fields in the policy are negative as they are aliased by the 'validate' field. Fix by changing the attribute type to 'NLA_BINARY' which is consistent with the above comment and all other users of NLA_POLICY_VALIDATE_FN(). As a result, move the length validation to the validation function. No regressions in MPLS tests: # ./tdc.py -f tc-tests/actions/mpls.json [...] # echo $? 0 [1] WARNING: CPU: 0 PID: 17743 at lib/nlattr.c:118 nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117 Modules linked in: CPU: 0 PID: 17743 Comm: syz-executor.0 Not tainted 6.1.0-rc8 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014 RIP: 0010:nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117 [...] Call Trace: __netlink_policy_dump_write_attr+0x23d/0x990 net/netlink/policy.c:310 netlink_policy_dump_write_attr+0x22/0x30 net/netlink/policy.c:411 netlink_ack_tlv_fill net/netlink/af_netlink.c:2454 [inline] netlink_ack+0x546/0x760 net/netlink/af_netlink.c:2506 netlink_rcv_skb+0x1b7/0x240 net/netlink/af_netlink.c:2546 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6109 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [i

Affected

16 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.7-1 (bookworm)	linux 6.1.7-1 (bookworm)
linux	linux	—	—
linux	linux	>= 2a2ea50870baa3fb4de0872c5b60828138654ca7 < 2b157c3c5d6b8ddca48d53c9e662032f65af8d61	2b157c3c5d6b8ddca48d53c9e662032f65af8d61
linux	linux	>= 2a2ea50870baa3fb4de0872c5b60828138654ca7 < 453277feb41c2235cf2c0de9209eef962c401457	453277feb41c2235cf2c0de9209eef962c401457
linux	linux	>= 2a2ea50870baa3fb4de0872c5b60828138654ca7 < 9e2c38827cdc6fdd3bb375c8607fc04d289756f9	9e2c38827cdc6fdd3bb375c8607fc04d289756f9
linux	linux	>= 2a2ea50870baa3fb4de0872c5b60828138654ca7 < 8a97b544b98e44f596219ebb290fd2ba2fd5d644	8a97b544b98e44f596219ebb290fd2ba2fd5d644
linux	linux	>= 2a2ea50870baa3fb4de0872c5b60828138654ca7 < 9e17f99220d111ea031b44153fdfe364b0024ff2	9e17f99220d111ea031b44153fdfe364b0024ff2
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 5.11 < 5.15.89	5.15.89
linux	linux_kernel	>= 5.16 < 6.1.7	6.1.7
linux	linux_kernel	>= 5.3 < 5.4.229	5.4.229
linux	linux_kernel	>= 5.5 < 5.10.164	5.10.164

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv7.8HIGH

vendor_debian7.8HIGH

vendor_redhat7.8HIGH

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