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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-26883

bpf: Fix stackmap overflow check on 32-bit arches

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.

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

  • 063c722dd9d285d877e6fd499e753d6224f4c046 to < d0e214acc59145ce25113f617311aa79dda39cb3affected
  • 7e3a6b820535eb395784060ae26c5af579528fa0 to < 21e5fa4688e1a4d3db6b72216231b24232f75c1daffected
  • 8032bf2af9ce26b3a362b9711d15f626ab946a74 to < 15641007df0f0d35fa28742b25c2a7db9dcd6895affected
  • 6183f4d3a0a2ad230511987c6c362ca43ec0055f to < ca1f06e72dec41ae4f76e7b1a8a97265447b46aeaffected
  • 6183f4d3a0a2ad230511987c6c362ca43ec0055f to < f06899582ccee09bd85d0696290e3eaca9aa042daffected
  • 6183f4d3a0a2ad230511987c6c362ca43ec0055f to < 7070b274c7866a4c5036f8d54fcaf315c64ac33aaffected
  • 6183f4d3a0a2ad230511987c6c362ca43ec0055f to < 43f798b9036491fb014b55dd61c4c5c3193267d0affected
  • 6183f4d3a0a2ad230511987c6c362ca43ec0055f to < 0971126c8164abe2004b8536b49690a0d6005b0aaffected
  • 6183f4d3a0a2ad230511987c6c362ca43ec0055f to < 7a4b21250bf79eef26543d35bd390448646c536baffected
  • 253150830a012adfccf90afcebae8fda5b05a80faffected
  • 766107351731ae223ebf60ca22bdfeb47ce6acc8affected
  • 4.19.177 to < 4.19.311affected
  • 5.4.99 to < 5.4.273affected
  • 5.10.17 to < 5.10.214affected
  • 4.9.258 to < 4.10affected
  • 4.14.222 to < 4.15affected

Linux Linux

Default version status: affected

  • 5.11affected
  • 0 to < 5.11unaffected
  • 4.19.311 to ≤ 4.19.*unaffected
  • 5.4.273 to ≤ 5.4.*unaffected
  • 5.10.214 to ≤ 5.10.*unaffected
  • 5.15.153 to ≤ 5.15.*unaffected
  • 6.1.83 to ≤ 6.1.*unaffected
  • 6.6.23 to ≤ 6.6.*unaffected
  • 6.7.11 to ≤ 6.7.*unaffected
  • 6.8.2 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References