scsi: core: Validate MODE SENSE lengths in scsi_cdl_enable()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98232
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:10 UTC
Updated2026-10-06 09:18:10 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: scsi: core: Validate MODE SENSE lengths in scsi_cdl_enable() scsi_cdl_enable() uses length fields returned by MODE SENSE to locate the ATA feature mode page in a 64-byte stack buffer. A target can report a total length shorter than its mode header and block descriptors. The unsigned subtraction used for the MODE SELECT length can wrap, and the separately computed buf_data can point beyond buf. During automatic scan, enable is false, so the read-modify-write of buf_data[4] can clear the low two bits of a target-selected out-of-bounds stack byte. scsi_mode_select() can then copy up to 64 bytes from outside the buffer into the outgoing MODE SELECT payload, disclosing stack contents to the target. This is reachable while scanning a USB storage device that identifies as an ATA device and advertises CDL support. No filesystem mount or userspace access to the block device is required. On upstream commit cee9395acd80 ("Linux 7.3-rc1"), a build-specific, one-vCPU QEMU/Raw Gadget proof using QEMU-only multi-UDC allocator sampling executed a fixed proof command inside the guest and created a UID-0-owned marker during automatic enumeration, with KASLR and NX enabled. The issue was independently found during security research at Drivesec S.r.l. Cap the available length to the buffer size. Validate and consume the mode header and block descriptor lengths before using the page, and require the five bytes needed to access the CDL field.

Risk And Classification

EPSS: 0.001750000 probability, percentile 0.063840000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1b22cfb14142aba7742d307c4f8d7006f919308c 39491a1ae93054fea10b4030180e5c797b2c0343 git Not specified
CNA Linux Linux affected 1b22cfb14142aba7742d307c4f8d7006f919308c 60b0b8ce803e3c2b2a9e5485ab3f88599fb4c7a4 git Not specified
CNA Linux Linux affected 1b22cfb14142aba7742d307c4f8d7006f919308c 6233d0b3ef4623df0d6934dc8b93b161e9854f6b git Not specified
CNA Linux Linux affected 1b22cfb14142aba7742d307c4f8d7006f919308c 99a6e4a9176da456904b67dcbae6e77d122782b7 git Not specified
CNA Linux Linux affected 1b22cfb14142aba7742d307c4f8d7006f919308c 3d676e458fe0c566f5a62753dc696b6a862fc412 git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/99a6e4a9176da456904b67dcbae6e77d122782b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d676e458fe0c566f5a62753dc696b6a862fc412 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6233d0b3ef4623df0d6934dc8b93b161e9854f6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39491a1ae93054fea10b4030180e5c797b2c0343 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/60b0b8ce803e3c2b2a9e5485ab3f88599fb4c7a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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