CVE-2025-39788 (GCVE-0-2025-39788)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:56 – Updated: 2025-11-03 17:43
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE On Google gs101, the number of UTP transfer request slots (nutrs) is 32, and in this case the driver ends up programming the UTRL_NEXUS_TYPE incorrectly as 0. This is because the left hand side of the shift is 1, which is of type int, i.e. 31 bits wide. Shifting by more than that width results in undefined behaviour. Fix this by switching to the BIT() macro, which applies correct type casting as required. This ensures the correct value is written to UTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift warning: UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21 shift exponent 32 is too large for 32-bit type 'int' For consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE write.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < 01510a9e8222f11cce064410f3c2fcf0756c0a08 (git)
Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < 098b2c8ee208c77126839047b9e6e1925bb35baa (git)
Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < c1f025da8f370a015e412b55cbcc583f91de8316 (git)
Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < 6d53b2a134da77eb7fe65c5c7c7a3c193539a78a (git)
Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < dc8fb963742f1a38d284946638f9358bdaa0ddee (git)
Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < 5b9f1ef293428ea9c0871d96fcec2a87c4445832 (git)
Affected: 55f4b1f73631a0817717fe6e98517de51b4c3527 , < 01aad16c2257ab8ff33b152b972c9f2e1af47912 (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE\n\nOn Google gs101, the number of UTP transfer request slots (nutrs) is 32,\nand in this case the driver ends up programming the UTRL_NEXUS_TYPE\nincorrectly as 0.\n\nThis is because the left hand side of the shift is 1, which is of type\nint, i.e. 31 bits wide. Shifting by more than that width results in\nundefined behaviour.\n\nFix this by switching to the BIT() macro, which applies correct type\ncasting as required. This ensures the correct value is written to\nUTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift\nwarning:\n\n    UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21\n    shift exponent 32 is too large for 32-bit type \u0027int\u0027\n\nFor consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE\nwrite."
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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