CVE-2025-40049

Squashfs: fix uninit-value in squashfs_get_parent

Not available

At a glance

Source
NVD
EPSS
EPSS 0.23 % · percentile 13 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: fix uninit-value in squashfs_get_parent Syzkaller reports a "KMSAN: uninit-value in squashfs_get_parent" bug. This is caused by open_by_handle_at() being called with a file handle containing an invalid parent inode number. In particular the inode number is that of a symbolic link, rather than a directory. Squashfs_get_parent() gets called with that symbolic link inode, and accesses the parent member field. unsigned int parent_ino = squashfs_i(inode)->parent; Because non-directory inodes in Squashfs do not have a parent value, this is uninitialised, and this causes an uninitialised value access. The fix is to initialise parent with the invalid inode 0, which will cause an EINVAL error to be returned. Regular inodes used to share the parent field with the block_list_start field. This is removed in this commit to enable the parent field to contain the invalid inode number 0.

References

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 122601408d20c77704268f1dea9f9ce4abf997c2 < f81a5bc9e924ee1950e0dd82bd10749048390f6e ; affected 122601408d20c77704268f1dea9f9ce4abf997c2 < 382a47fae449e554ef1e8c198667fd2f3270b945 ; affected 122601408d20c77704268f1dea9f9ce4abf997c2 < 61d38b5ce2782bff3cacaacbb8164087a73ed1a5 ; affected 122601408d20c77704268f1dea9f9ce4abf997c2 < 81a2bca52d43fc9d9abf07408b91255131c5dc53 ; affected 122601408d20c77704268f1dea9f9ce4abf997c2 < c28b0ca029edf5d0558abcd76cb8c732706cd339 ; affected 122601408d20c77704268f1dea9f9ce4abf997c2 < 1b3ccd0019132880c94bb00ca7088c1749308f82
Linux · Linuxaffected 2.6.29 ; unaffected 0 < 2.6.29 ; unaffected 5.4.301 ≤ 5.4.* ; unaffected 5.10.246 ≤ 5.10.* ; unaffected 5.15.195 ≤ 5.15.* ; unaffected 6.1.156 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD