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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2023-52676

bpf: Guard stack limits against 32bit overflow

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard stack limits against 32bit overflow This patch promotes the arithmetic around checking stack bounds to be done in the 64-bit domain, instead of the current 32bit. The arithmetic implies adding together a 64-bit register with a int offset. The register was checked to be below 1<<29 when it was variable, but not when it was fixed. The offset either comes from an instruction (in which case it is 16 bit), from another register (in which case the caller checked it to be below 1<<29 [1]), or from the size of an argument to a kfunc (in which case it can be a u32 [2]). Between the register being inconsistently checked to be below 1<<29, and the offset being up to an u32, it appears that we were open to overflowing the `int`s which were currently used for arithmetic. [1] https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L7494-L7498 [2] https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L11904

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

  • f3c4b01689d392373301e6e60d1b02c5b4020afc to < ad1754f86a87fe74912fb542b23ff24ada4e3307affected
  • 01f810ace9ed37255f27608a0864abebccf0aab3 to < 4ba97610399e83d29d1086a0827d33172539b49baffected
  • 01f810ace9ed37255f27608a0864abebccf0aab3 to < e160b2ed94a20fa940369ebd914277f88005e70daffected
  • 01f810ace9ed37255f27608a0864abebccf0aab3 to < ad140fc856f0b1d5e2215bcb6d0cc247a86805a2affected
  • 01f810ace9ed37255f27608a0864abebccf0aab3 to < e5ad9ecb84405637df82732ee02ad741a5f782a6affected
  • 01f810ace9ed37255f27608a0864abebccf0aab3 to < 1d38a9ee81570c4bd61f557832dead4d6f816760affected
  • d1b725ea5d104caea250427899f4e2e3ab15b4fcaffected
  • 5.10.33 to < 5.10.270affected
  • 5.11.17 to < 5.12affected

Linux Linux

Default version status: affected

  • 5.12affected
  • 0 to < 5.12unaffected
  • 5.10.270 to ≤ 5.10.*unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.14 to ≤ 6.6.*unaffected
  • 6.7.2 to ≤ 6.7.*unaffected
  • 6.8 to ≤ *unaffected

References