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CVE-2025-68740

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <c2238d487a640ae3511e1b6f4640ab27ce10d7f6, 6.18.2, 6.1.160, 0, 6.6.120, 6.17.13, 5.15.198, <=5.10.*, <88cd5fbf5869731be8fc6f7cecb4e0d6ab3d8749, <de4431faf308d0c533cb386f5fa9af009bc86158, 2.6.30, <=6.6.*, <2.6.30, <=6.18.*, 6.12.63, 4af4662fa4a9dc62289c580337ae2506339c4729, <f2f4627b74c120fcdd8e1db93bc91f9bbaf46f85, 5.10.248, <cca3e7df3c0f99542033657ba850b9a6d27f8784, <=*, <=5.15.*, <=6.17.*, 6.19, <d14e0ec6a6828ee0dffa163fb5d513c9a21f0a51, <738c9738e690f5cea24a3ad6fd2d9a323cf614f6, <32952c4f4d1b2deb30dce72ba109da808a9018e1

Description

In the Linux kernel, the following vulnerability has been resolved: ima: Handle error code returned by ima_filter_rule_match() In ima_match_rules(), if ima_filter_rule_match() returns -ENOENT due to the rule being NULL, the function incorrectly skips the 'if (!rc)' check and sets 'result = true'. The LSM rule is considered a match, causing extra files to be measured by IMA. This issue can be reproduced in the following scenario: After unloading the SELinux policy module via 'semodule -d', if an IMA measurement is triggered before ima_lsm_rules is updated, in ima_match_rules(), the first call to ima_filter_rule_match() returns -ESTALE. This causes the code to enter the 'if (rc == -ESTALE && !rule_reinitialized)' block, perform ima_lsm_copy_rule() and retry. In ima_lsm_copy_rule(), since the SELinux module has been removed, the rule becomes NULL, and the second call to ima_filter_rule_match() returns -ENOENT. This bypasses the 'if (!rc)' check and results in a false match. Call trace: selinux_audit_rule_match+0x310/0x3b8 security_audit_rule_match+0x60/0xa0 ima_match_rules+0x2e4/0x4a0 ima_match_policy+0x9c/0x1e8 ima_get_action+0x48/0x60 process_measurement+0xf8/0xa98 ima_bprm_check+0x98/0xd8 security_bprm_check+0x5c/0x78 search_binary_handler+0x6c/0x318 exec_binprm+0x58/0x1b8 bprm_execve+0xb8/0x130 do_execveat_common.isra.0+0x1a8/0x258 __arm64_sys_execve+0x48/0x68 invoke_syscall+0x50/0x128 el0_svc_common.constprop.0+0xc8/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x44/0x200 el0t_64_sync_handler+0x100/0x130 el0t_64_sync+0x3c8/0x3d0 Fix this by changing 'if (!rc)' to 'if (rc <= 0)' to ensure that error codes like -ENOENT do not bypass the check and accidentally result in a successful match.

Gravité et risque d'exploitation

CVE-2025-68740 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 10.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <c2238d487a640ae3511e1b6f4640ab27ce10d7f6, 6.18.2, 6.1.160, 0, 6.6.120, 6.17.13, 5.15.198, <=5.10.*, <88cd5fbf5869731be8fc6f7cecb4e0d6ab3d8749, <de4431faf308d0c533cb386f5fa9af009bc86158, 2.6.30, <=6.6.*, <2.6.30, <=6.18.*, 6.12.63, 4af4662fa4a9dc62289c580337ae2506339c4729, <f2f4627b74c120fcdd8e1db93bc91f9bbaf46f85, 5.10.248, <cca3e7df3c0f99542033657ba850b9a6d27f8784, <=*, <=5.15.*, <=6.17.*, 6.19, <d14e0ec6a6828ee0dffa163fb5d513c9a21f0a51, <738c9738e690f5cea24a3ad6fd2d9a323cf614f6, <32952c4f4d1b2deb30dce72ba109da808a9018e1) 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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