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CVE-2022-49197

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.3%
Linux•Linux•Versions : 5.15.33, <=5.17.*, <f75f4abeec4c04b600a15b50c89a481f1e7435ee, 5.18, <ac5883a8890a11c00b32a19949a25d4afeaa2f5a, <2.6.14, <e23e1e981247feb3c7d0236fe58aceb685f234ae, 0, f7fa9b10edbb9391bdd4ec8e8b3d621d0664b198, <=4.9.*, <=5.10.*, 4.9.311, <=4.14.*, <e1c5d46f05aa23d740daae5cd3a6472145afac42, 2.6.14, <7409ff6393a67ff9838d0ae1bd102fb5f020d07a, 5.4.189, <41249fff507387c3323b198d0052faed08b14de4, <=5.4.*, <=4.19.*, 5.16.19, <=5.16.*, <b0898362188e05b2202656058cc32d98fabf3bac, <e8aaf3134bc5e943048eefe9f2ddaabf41d92b1a, 5.10.110, 4.14.276, 5.17.2, <=*, 4.19.238, <=5.15.*, <0caf6d9922192dd1afa8dc2131abfb4df1443b9f

Description

In the Linux kernel, the following vulnerability has been resolved: af_netlink: Fix shift out of bounds in group mask calculation When a netlink message is received, netlink_recvmsg() fills in the address of the sender. One of the fields is the 32-bit bitfield nl_groups, which carries the multicast group on which the message was received. The least significant bit corresponds to group 1, and therefore the highest group that the field can represent is 32. Above that, the UB sanitizer flags the out-of-bounds shift attempts. Which bits end up being set in such case is implementation defined, but it's either going to be a wrong non-zero value, or zero, which is at least not misleading. Make the latter choice deterministic by always setting to 0 for higher-numbered multicast groups. To get information about membership in groups >= 32, userspace is expected to use nl_pktinfo control messages[0], which are enabled by NETLINK_PKTINFO socket option. [0] https://lwn.net/Articles/147608/ The way to trigger this issue is e.g. through monitoring the BRVLAN group: # bridge monitor vlan & # ip link add name br type bridge Which produces the following citation: UBSAN: shift-out-of-bounds in net/netlink/af_netlink.c:162:19 shift exponent 32 is too large for 32-bit type 'int'

Gravité et risque d'exploitation

CVE-2022-49197 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 0.28 %, ce qui la place devant 18.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 5.15.33, <=5.17.*, <f75f4abeec4c04b600a15b50c89a481f1e7435ee, 5.18, <ac5883a8890a11c00b32a19949a25d4afeaa2f5a, <2.6.14, <e23e1e981247feb3c7d0236fe58aceb685f234ae, 0, f7fa9b10edbb9391bdd4ec8e8b3d621d0664b198, <=4.9.*, <=5.10.*, 4.9.311, <=4.14.*, <e1c5d46f05aa23d740daae5cd3a6472145afac42, 2.6.14, <7409ff6393a67ff9838d0ae1bd102fb5f020d07a, 5.4.189, <41249fff507387c3323b198d0052faed08b14de4, <=5.4.*, <=4.19.*, 5.16.19, <=5.16.*, <b0898362188e05b2202656058cc32d98fabf3bac, <e8aaf3134bc5e943048eefe9f2ddaabf41d92b1a, 5.10.110, 4.14.276, 5.17.2, <=*, 4.19.238, <=5.15.*, <0caf6d9922192dd1afa8dc2131abfb4df1443b9f) 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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