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CVE-2026-93048

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <3.2, <=6.12.*, <e204e5c49a012f99638633fdbd773e3c86260053, 5.15.221, <c645f6dd1af2ecc70fd3578e141f2f71fa9e4eff, 5.10.270, 0, 6.1.188, <701c3ae7273e1adc20db5d97c42e0139b479f16b, 6.18.52, <a536eb57be58442b19398b2783071007ecfb1735, <=5.10.*, <=6.6.*, <b759d5bb6265419344ee9729fd0dc07ad85719d8, 6.6.157, <398aca2f90122d5abbabff1079deaeb885fe9e40, 7.2.6, <6aaab2ace3f7b55733d904e5549acf8405f03642, 1a31368bf92ef2a7da3ba379672c405bd2751df9, <=6.18.*, 3.2, 6.12.110, <=7.2.*, <=*, <181c1bff940e7d3e34ca485d37e3cdbfe409203c, <=5.15.*, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition() mtd_add_partition() does not reject the special offset value MTDPART_OFS_RETAIN (-3), which leads to a WARN_ON in add_mtd_device() when called through the BLKPG ioctl on NAND devices. The RETAIN value depends on cur_offset being the end of the previous partition, but in the dynamic partition path cur_offset equals the offset argument itself, causing undefined behavior. Commit 5daa7b21496a ("mtd: prepare partition add and del functions for ioctl requests") introduced mtd_add_partition() and correctly rejected MTDPART_OFS_APPEND (-1) and MTDPART_OFS_NXTBLK (-2), since those special offsets rely on cur_offset tracking the previous partition's end. However, commit 1a31368bf92e ("mtd: add a flags for partitions which should just leave smth. after them") later added MTDPART_OFS_RETAIN (-3) for the static partition table path without updating mtd_add_partition() to also reject this value. With offset=-3 passed via BLKPG, the RETAIN size calculation in allocate_partition() underflows (parent_size - 0xFFFFFFFFFFFFFFFD = parent_size + 3). If the underflow result does not appear to leave enough space, allocate_partition() jumps to out_register via goto, skipping erasesize initialization. This results in erasesize=0, which triggers: WARN_ON((!mtd->erasesize || !master->_erase) && !(mtd->flags & MTD_NO_ERASE)) in add_mtd_device(). If the underflow result appears to leave enough space, a bogus partition size is calculated, but the "out of reach" sanity check catches the invalid offset and creates a disabled empty partition (offset=0, size=0) instead of returning an error. Fix this by adding MTDPART_OFS_RETAIN to the rejection list in mtd_add_partition(), consistent with the existing handling of APPEND and NXTBLK.

Gravité et risque d'exploitation

CVE-2026-93048 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 10.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <3.2, <=6.12.*, <e204e5c49a012f99638633fdbd773e3c86260053, 5.15.221, <c645f6dd1af2ecc70fd3578e141f2f71fa9e4eff, 5.10.270, 0, 6.1.188, <701c3ae7273e1adc20db5d97c42e0139b479f16b, 6.18.52, <a536eb57be58442b19398b2783071007ecfb1735, <=5.10.*, <=6.6.*, <b759d5bb6265419344ee9729fd0dc07ad85719d8, 6.6.157, <398aca2f90122d5abbabff1079deaeb885fe9e40, 7.2.6, <6aaab2ace3f7b55733d904e5549acf8405f03642, 1a31368bf92ef2a7da3ba379672c405bd2751df9, <=6.18.*, 3.2, 6.12.110, <=7.2.*, <=*, <181c1bff940e7d3e34ca485d37e3cdbfe409203c, <=5.15.*, 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

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