Heimdall Security Logo

CVE-2026-89616

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.5 · Élevée
EPSS 0.4%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd, 5.15.221, <4a1b39b2e10eb8de86265e80cf2be4396bc1dce4, 0, <77d8efd04745cda23858546afdbd9d07b591758e, 7.2.4, 6.1.188, <7d60a4c49af4d5cb88aa7cbf998d0408bd415055, <376ee45659a4b943df672ad275c63da00655f929, 4342306f0f0d5ff4315a204d315c1b51b914fca5, <=6.6.*, <5.15, 6.6.157, <0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea, 5.15, <=6.18.*, <=7.2.*, <cd40eee4923d104ebec9ac7513b971bc441e431d, <=*, <=5.15.*, 6.18.50, 6.12.109, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame() ni_read_frame() decompresses an LZNT $DATA frame into the vmapped target pages and then trusts decompress_lznt()'s return value: unc_size = decompress_lznt(frame_ondisk, ondisk_size, frame_mem, frame_size); if ((ssize_t)unc_size < 0) err = unc_size; else if (!unc_size || unc_size > frame_size) err = -EINVAL; decompress_lznt() stops as soon as the compressed stream is exhausted (e.g. a zero chunk header) and returns the number of bytes it actually wrote, which may be far less than frame_size. The bytes between unc_size and frame_size are never written. The only memset() that follows zeroes the region beyond i_valid; when the frame lies entirely within the file's valid size that memset() does not run, so the gap retains whatever was in the just-vmapped pages. All pages are then marked uptodate and returned to userspace, disclosing uninitialized (recently-freed) kernel page memory. A crafted compressed file whose stream decompresses to only a few bytes leaks the remainder of every frame on a plain read(2), which is enough to recover kernel pointers and defeat KASLR. Zero the [unc_size, frame_size) tail immediately after a successful LZNT decompress so the remainder reads back as zero.

Gravité et risque d'exploitation

CVE-2026-89616 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.41 %, ce qui la place devant 34.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd, 5.15.221, <4a1b39b2e10eb8de86265e80cf2be4396bc1dce4, 0, <77d8efd04745cda23858546afdbd9d07b591758e, 7.2.4, 6.1.188, <7d60a4c49af4d5cb88aa7cbf998d0408bd415055, <376ee45659a4b943df672ad275c63da00655f929, 4342306f0f0d5ff4315a204d315c1b51b914fca5, <=6.6.*, <5.15, 6.6.157, <0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea, 5.15, <=6.18.*, <=7.2.*, <cd40eee4923d104ebec9ac7513b971bc441e431d, <=*, <=5.15.*, 6.18.50, 6.12.109, 7.3) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE