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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-49850

bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL referencing a non-existing BTF type, function bpf_core_calc_relo_insn would cause a null pointer deference. Fix this by adding a proper check upper in call stack, as malformed relocation records could be passed from user space. Simplest reproducer is a program: r0 = 0 exit With a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL, See the link for original reproducer or next commit for a test case.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 74753e1462e77349525daf9eb60ea21ed92d3a97 to < dc7ce14f00bcd50641f2110b7a32aa6552e0780faffected
  • 74753e1462e77349525daf9eb60ea21ed92d3a97 to < 2288b54b96dcb55bedebcef3572bb8821fc5e708affected
  • 74753e1462e77349525daf9eb60ea21ed92d3a97 to < 584cd3ff792e1edbea20b2a7df55897159b0be3eaffected
  • 74753e1462e77349525daf9eb60ea21ed92d3a97 to < e7e9c5b2dda29067332df2a85b0141a92b41f218affected
  • 74753e1462e77349525daf9eb60ea21ed92d3a97 to < 3d2786d65aaa954ebd3fcc033ada433e10da21c4affected

Linux Linux

Default version status: affected

  • 5.17affected
  • 0 to < 5.17unaffected
  • 6.1.113 to ≤ 6.1.*unaffected
  • 6.6.54 to ≤ 6.6.*unaffected
  • 6.10.13 to ≤ 6.10.*unaffected
  • 6.11.2 to ≤ 6.11.*unaffected
  • 6.12 to ≤ *unaffected

References