powerpc/kasan: Fix addr error caused by page alignment

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Summary

CVECVE-2024-26712
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-04-03 15:15:53 UTC
Updated2026-08-04 11:16:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Fix addr error caused by page alignment In kasan_init_region, when k_start is not page aligned, at the begin of for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then `va = block + k_cur - k_start` is less than block, the addr va is invalid, because the memory address space from va to block is not alloced by memblock_alloc, which will not be reserved by memblock_reserve later, it will be used by other places. As a result, memory overwriting occurs. for example: int __init __weak kasan_init_region(void *start, size_t size) { [...] /* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */ block = memblock_alloc(k_end - k_start, PAGE_SIZE); [...] for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { /* at the begin of for loop * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400) * va(dcd96c00) is less than block(dcd97000), va is invalid */ void *va = block + k_cur - k_start; [...] } [...] } Therefore, page alignment is performed on k_start before memblock_alloc() to ensure the validity of the VA address.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from ADP

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo | CWE-noinfo Not enough information

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 663c0c9496a69f80011205ba3194049bcafd681d 230e89b5ad0a33f530a2a976b3e5e4385cb27882 git Not specified
CNA Linux Linux affected 663c0c9496a69f80011205ba3194049bcafd681d 2738e0aa2fb24a7ab9c878d912dc2b239738c6c6 git Not specified
CNA Linux Linux affected 663c0c9496a69f80011205ba3194049bcafd681d 0c09912dd8387e228afcc5e34ac5d79b1e3a1058 git Not specified
CNA Linux Linux affected 663c0c9496a69f80011205ba3194049bcafd681d 0516c06b19dc64807c10e01bb99b552bdf2d7dbe git Not specified
CNA Linux Linux affected 663c0c9496a69f80011205ba3194049bcafd681d 70ef2ba1f4286b2b73675aeb424b590c92d57b25 git Not specified
CNA Linux Linux affected 663c0c9496a69f80011205ba3194049bcafd681d 4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0 git Not specified
CNA Linux Linux affected 5ce93076d8ee2a0fac3ad4adbd2e91b6197146db git Not specified
CNA Linux Linux affected 5.3.6 5.4 semver Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 semver Not specified
CNA Linux Linux unaffected 5.10.210 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.149 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.79 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.18 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.6 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 6000567 Debian Security Update for linux (DSA 5658-1)

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