Heimdall Security Logo

CVE-2026-89586

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.2 · Élevée
EPSS 0.6%
Linux•Linux•Versions : <04e2befe25792f2e90097f284d7e86fc6bcfe928, <=6.1.*, <=6.12.*, <07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53, 5.15.221, <79cce911e623c0baa0fde307ce3a434e084b881a, 0, <c2e3dccd6870659851eaa4c12ab16418b8e3040a, 5.10.270, 7.2.4, 6.1.188, ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff, <07baa310ea3224a7044b1ca84796bb37a235af1f, <=5.10.*, <=6.6.*, <977554ed91b54075fbc0bac536316b4841ef6258, 6.6.157, <4.9, <=6.18.*, 7.3, <=7.2.*, <4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d, <=*, 4.9, <=5.15.*, 6.18.50, 6.12.109, <b7b5ab2df325ffbbad7ca2debaa071e024d68cb5

Description

In the Linux kernel, the following vulnerability has been resolved: ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes ata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with the UNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command. The TRIM descriptor is built by ata_format_dsm_trim_descr() into the 2048-byte ata_scsi_rbuf staging buffer, and the number of bytes copied is compared against the logical sector size by the caller: size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); if (size != len) /* len == sdp->sector_size */ goto invalid_param_len; ata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE (2048). On a device whose logical sector size exceeds that (e.g. a 4Kn device, where sector_size == 4096) the function can never return more than 2048, while the caller expects it to return sector_size. The comparison therefore always fails, so every TRIM is rejected with "Parameter list length error" and WARN_ON() splats on each attempt. TRIM / discard is thus completely broken on such devices. The descriptor was incorrectly sized from the logical sector size. A DSM TRIM payload is a list of 512-byte pages, each holding up to ATA_MAX_TRIM_RNUM (64) LBA Range Entries, and is independent of the logical sector size. The Block Limits VPD page already advertises a single such page as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical blocks), so the block layer never sends a request that needs more than one page. Emit exactly one 512-byte page, independent of the logical sector size, and transfer only that page (COUNT == 1). For a 512-byte-sector device this is unchanged; devices with larger logical sectors now work instead of failing every TRIM.

Gravité et risque d'exploitation

CVE-2026-89586 obtient un score CVSS de 8.2/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.61 %, ce qui la place devant 48.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <04e2befe25792f2e90097f284d7e86fc6bcfe928, <=6.1.*, <=6.12.*, <07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53, 5.15.221, <79cce911e623c0baa0fde307ce3a434e084b881a, 0, <c2e3dccd6870659851eaa4c12ab16418b8e3040a, 5.10.270, 7.2.4, 6.1.188, ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff, <07baa310ea3224a7044b1ca84796bb37a235af1f, <=5.10.*, <=6.6.*, <977554ed91b54075fbc0bac536316b4841ef6258, 6.6.157, <4.9, <=6.18.*, 7.3, <=7.2.*, <4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d, <=*, 4.9, <=5.15.*, 6.18.50, 6.12.109, <b7b5ab2df325ffbbad7ca2debaa071e024d68cb5) 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