Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2023-53474

x86/MCE/AMD: Use an u64 for bank_map

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.180, 5.15.111, 6.1.28, 6.2.15, 6.3.2
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/MCE/AMD: Use an u64 for bank_map Thee maximum number of MCA banks is 64 (MAX_NR_BANKS), see a0bc32b3cacf ("x86/mce: Increase maximum number of banks to 64"). However, the bank_map which contains a bitfield of which banks to initialize is of type unsigned int and that overflows when those bit numbers are >= 32, leading to UBSAN complaining correctly: UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38 shift exponent 32 is too large for 32-bit type 'int' Change the bank_map to a u64 and use the proper BIT_ULL() macro when modifying bits in there. [ bp: Rewrite commit message. ]

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From a0bc32b3cacf194dc479b342f006203fd1e1941a · fixed in a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83; From a0bc32b3cacf194dc479b342f006203fd1e1941a · fixed in 11c58a0c1937c157dbdf82d5ab634d68c99f3098; From a0bc32b3cacf194dc479b342f006203fd1e1941a · fixed in ba8ffb1251eb629c2ec35220e3896cf4f7b888a7; From a0bc32b3cacf194dc479b342f006203fd1e1941a · fixed in 9669fa17287c3af2bbd4868d4c8fdd9e57f8332e; From a0bc32b3cacf194dc479b342f006203fd1e1941a · fixed in 67bb7521b6420d81dab7538c0686f18f7d6d09f4; From a0bc32b3cacf194dc479b342f006203fd1e1941a · fixed in 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156

  • Linux Linux

    5.10

  • KernelLinux

    From 5.10.0 · fixed in 5.10.180; From 5.11.0 · fixed in 5.15.111; From 5.16.0 · fixed in 6.1.28; From 6.2.0 · fixed in 6.2.15; From 6.3.0 · fixed in 6.3.2

References 6

git.kernel.org