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CVE-2026-80536

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.4 · Élevée
EPSS 0.1%
Linux•Linux•Versions : 6.1.185, <=6.1.*, <=6.12.*, 2.6.12, 6.12.106, <b7528b42813f02724a78fce1da24d69d1bfc4d38, <f7b5fa83e2c192be922121b764415fa8c7549ea1, 0, 5.10.267, <=7.1.*, 6.6.154, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <=5.10.*, <=6.6.*, <edaf5b6bd625356893da20d69a259b34a9de2694, <f3859c35a4fbc1c1c58431f684f808e43696891d, <=6.18.*, <acb4e26295e7f0e685815a3fd3d70bd8329cefa1, 7.1.10, <f8288214459ead7e87d26e5822f62c14a4f2ed6b, <=*, <=5.15.*, 6.18.46, <813f8136a2ce1fee266d02a7df73db6e8a541604, <7e32d4eebae6ca24f8a673c107fd7eca1f47afc2, 7.2, 5.15.218

Description

In the Linux kernel, the following vulnerability has been resolved: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT), item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on production kernels. A crafted image logging a small blf_len together with a bitmap bit past the end of that buffer drives the memcpy() past the buffer's allocation, corrupting adjacent kernel heap during mount-time log recovery. This is reachable by anyone who can get a crafted image mounted -- the malicious-filesystem threat model XFS already guards against elsewhere. Turn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts recovery of the buffer with -EFSCORRUPTED, consistent with the validate-and-fail idiom already used in xlog_recover_do_inode_buffer() and xfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore becomes STATIC int and its three callers propagate the error. Found and confirmed with KASAN on a CONFIG_XFS_DEBUG=n build: the crafted image trips a slab-out-of-bounds write before this change and fails recovery cleanly with -EFSCORRUPTED after it.

Gravité et risque d'exploitation

CVE-2026-80536 obtient un score CVSS de 8.4/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 3.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.1.185, <=6.1.*, <=6.12.*, 2.6.12, 6.12.106, <b7528b42813f02724a78fce1da24d69d1bfc4d38, <f7b5fa83e2c192be922121b764415fa8c7549ea1, 0, 5.10.267, <=7.1.*, 6.6.154, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <=5.10.*, <=6.6.*, <edaf5b6bd625356893da20d69a259b34a9de2694, <f3859c35a4fbc1c1c58431f684f808e43696891d, <=6.18.*, <acb4e26295e7f0e685815a3fd3d70bd8329cefa1, 7.1.10, <f8288214459ead7e87d26e5822f62c14a4f2ed6b, <=*, <=5.15.*, 6.18.46, <813f8136a2ce1fee266d02a7df73db6e8a541604, <7e32d4eebae6ca24f8a673c107fd7eca1f47afc2, 7.2, 5.15.218) 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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