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CVE-2022-50478

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <62d11ec205ef14d8acf172cfc9904fdbf200025a, <610a2a3d7d8be3537458a378ec69396a76c385b6, 0, 4.14.303, <d464b035c0613856d012cf1704879d3ff3f057fb, <=4.9.*, <6b0ea3df56cccd53398d0289f399f19d43136b2e, <1012ff77284e3bec0ec0a35a820b03ec43dec2cc, 4.19.270, <=5.10.*, 2.6.30, <=4.14.*, <=6.0.*, 5.4.229, e339ad31f59925b48a92ee3947692fdf9758b8c7, 6.0.16, <=5.4.*, <a6f89b10042baca218c8598d6db5a44c7e32625f, <2.6.30, <=4.19.*, <d706485dffbbbf848e681edda29c7a46ac55698c, 4.9.337, 5.10.163, <=*, <b47f5c579c8186f7f5ab5e4254e0734ea5b7bf7a, <=5.15.*, <9b3ba54025357440d6c4414c670984f628c6f6bf, 6.1.2, 6.2, 5.15.86

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix shift-out-of-bounds/overflow in nilfs_sb2_bad_offset() Patch series "nilfs2: fix UBSAN shift-out-of-bounds warnings on mount time". The first patch fixes a bug reported by syzbot, and the second one fixes the remaining bug of the same kind. Although they are triggered by the same super block data anomaly, I divided it into the above two because the details of the issues and how to fix it are different. Both are required to eliminate the shift-out-of-bounds issues at mount time. This patch (of 2): If the block size exponent information written in an on-disk superblock is corrupted, nilfs_sb2_bad_offset helper function can trigger shift-out-of-bounds warning followed by a kernel panic (if panic_on_warn is set): shift exponent 38983 is too large for 64-bit type 'unsigned long long' Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322 nilfs_sb2_bad_offset fs/nilfs2/the_nilfs.c:449 [inline] nilfs_load_super_block+0xdf5/0xe00 fs/nilfs2/the_nilfs.c:523 init_nilfs+0xb7/0x7d0 fs/nilfs2/the_nilfs.c:577 nilfs_fill_super+0xb1/0x5d0 fs/nilfs2/super.c:1047 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 ... In addition, since nilfs_sb2_bad_offset() performs multiplication without considering the upper bound, the computation may overflow if the disk layout parameters are not normal. This fixes these issues by inserting preliminary sanity checks for those parameters and by converting the comparison from one involving multiplication and left bit-shifting to one using division and right bit-shifting.

Gravité et risque d'exploitation

CVE-2022-50478 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 0.17 %, ce qui la place devant 5.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <62d11ec205ef14d8acf172cfc9904fdbf200025a, <610a2a3d7d8be3537458a378ec69396a76c385b6, 0, 4.14.303, <d464b035c0613856d012cf1704879d3ff3f057fb, <=4.9.*, <6b0ea3df56cccd53398d0289f399f19d43136b2e, <1012ff77284e3bec0ec0a35a820b03ec43dec2cc, 4.19.270, <=5.10.*, 2.6.30, <=4.14.*, <=6.0.*, 5.4.229, e339ad31f59925b48a92ee3947692fdf9758b8c7, 6.0.16, <=5.4.*, <a6f89b10042baca218c8598d6db5a44c7e32625f, <2.6.30, <=4.19.*, <d706485dffbbbf848e681edda29c7a46ac55698c, 4.9.337, 5.10.163, <=*, <b47f5c579c8186f7f5ab5e4254e0734ea5b7bf7a, <=5.15.*, <9b3ba54025357440d6c4414c670984f628c6f6bf, 6.1.2, 6.2, 5.15.86) 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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