CVE-2022-50365

Summary

In the Linux kernel, the following vulnerability has been resolved:

skbuff: Account for tail adjustment during pull operations

Extending the tail can have some unexpected side effects if a program uses a helper like BPF_FUNC_skb_pull_data to read partial content beyond the head skb headlen when all the skbs in the gso frag_list are linear with no head_frag -

kernel BUG at net/core/skbuff.c:4219! pc : skb_segment+0xcf4/0xd2c lr : skb_segment+0x63c/0xd2c Call trace: skb_segment+0xcf4/0xd2c __udp_gso_segment+0xa4/0x544 udp4_ufo_fragment+0x184/0x1c0 inet_gso_segment+0x16c/0x3a4 skb_mac_gso_segment+0xd4/0x1b0 __skb_gso_segment+0xcc/0x12c udp_rcv_segment+0x54/0x16c udp_queue_rcv_skb+0x78/0x144 udp_unicast_rcv_skb+0x8c/0xa4 __udp4_lib_rcv+0x490/0x68c udp_rcv+0x20/0x30 ip_protocol_deliver_rcu+0x1b0/0x33c ip_local_deliver+0xd8/0x1f0 ip_rcv+0x98/0x1a4 deliver_ptype_list_skb+0x98/0x1ec __netif_receive_skb_core+0x978/0xc60

Fix this by marking these skbs as GSO_DODGY so segmentation can handle the tail updates accordingly.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux162a5a8c3aff15c449e6b38355cdf80ab4f77a5a < ff3743d00f41d803e6ab9334962b674f3b7fd0cbaffected
LinuxLinux55fb612bef7fd237fb70068e2b6ff1cd1543a8ef < 6ac417d71b80e74b002313fcd73f7e9008e8e457affected
LinuxLinux821302dd0c51d29269ef73a595bdff294419e2cd < 2d59f0ca153e9573ec4f140988c0ccca0eb4181baffected
LinuxLinux3dcbdb134f329842a38f0e6797191b885ab00a00 < 668dc454bcbd1da73605201ff43f988c70848215affected
LinuxLinux3dcbdb134f329842a38f0e6797191b885ab00a00 < 821be5a5ab09a40ba09cb5ba354f18cf7996fea0affected
LinuxLinux3dcbdb134f329842a38f0e6797191b885ab00a00 < 8fb773eed4909ef5dc1bbeb3629a337d3336df7eaffected
LinuxLinux3dcbdb134f329842a38f0e6797191b885ab00a00 < 946dd5dc4fcc4123cdfe3942b20012c4448cf89aaffected
LinuxLinux3dcbdb134f329842a38f0e6797191b885ab00a00 < 331615d837f4979eb91a336a223a5c7f7886ecd5affected
LinuxLinux3dcbdb134f329842a38f0e6797191b885ab00a00 < 2d7afdcbc9d32423f177ee12b7c93783aea338fbaffected
LinuxLinux92984818ff8cfd97311a5e0ac27f148a00df2b54affected
LinuxLinux4.9.194 < 4.9.337affected
LinuxLinux4.14.145 < 4.14.303affected
LinuxLinux4.19.74 < 4.19.270affected
LinuxLinux5.2.16 < 5.3affected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux4.9.337 <= 4.9.*unaffected
LinuxLinux4.14.303 <= 4.14.*unaffected
LinuxLinux4.19.270 <= 4.19.*unaffected
LinuxLinux5.4.229 <= 5.4.*unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.86 <= 5.15.*unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References