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CVE-2022-49235

Vulnérabilité moyenne dans Linux (Linux)

CVSS 5.5 · Moyenne
EPSS 0.3%
Linux•Linux•Versions : <e352acdd378e9263cc4c6018e588f2dac7161d07, 5.15.33, <=5.17.*, 5.18, <5abf2b761b998063f5e2bae93fd4ab10e2a80f10, <0b700f7d06492de34964b6f414120043364f8191, <7da6169b6ebb75816b57be3beb829afa74f3b4b6, 0, <11f11ac281f0c0b363d2940204f28bae0422ed71, <ee4222052a76559c20e821bc3519cefb58b6d3e9, <5c2a6a8daa17a3f65b38b9a5574bb362c13fa1d9, <d1e0df1c57bd30871dd1c855742a7c346dbca853, <=4.9.*, <=5.10.*, 4.9.311, <=4.14.*, 5.4.189, <=5.4.*, <=4.19.*, fb9987d0f748c983bb795a86f47522313f701a08, <2.6.35, 5.16.19, <=5.16.*, 5.10.110, 4.14.276, 5.17.2, <=*, 4.19.238, <=5.15.*, <4d244b731188e0b63fc40a9d2dec72e9181fb37c, 2.6.35

Description

In the Linux kernel, the following vulnerability has been resolved: ath9k_htc: fix uninit value bugs Syzbot reported 2 KMSAN bugs in ath9k. All of them are caused by missing field initialization. In htc_connect_service() svc_meta_len and pad are not initialized. Based on code it looks like in current skb there is no service data, so simply initialize svc_meta_len to 0. htc_issue_send() does not initialize htc_frame_hdr::control array. Based on firmware code, it will initialize it by itself, so simply zero whole array to make KMSAN happy Fail logs: BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x6c1/0x2aa0 drivers/usb/core/urb.c:430 usb_submit_urb+0x6c1/0x2aa0 drivers/usb/core/urb.c:430 hif_usb_send_regout drivers/net/wireless/ath/ath9k/hif_usb.c:127 [inline] hif_usb_send+0x5f0/0x16f0 drivers/net/wireless/ath/ath9k/hif_usb.c:479 htc_issue_send drivers/net/wireless/ath/ath9k/htc_hst.c:34 [inline] htc_connect_service+0x143e/0x1960 drivers/net/wireless/ath/ath9k/htc_hst.c:275 ... Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] htc_connect_service+0x1029/0x1960 drivers/net/wireless/ath/ath9k/htc_hst.c:258 ... Bytes 4-7 of 18 are uninitialized Memory access of size 18 starts at ffff888027377e00 BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x6c1/0x2aa0 drivers/usb/core/urb.c:430 usb_submit_urb+0x6c1/0x2aa0 drivers/usb/core/urb.c:430 hif_usb_send_regout drivers/net/wireless/ath/ath9k/hif_usb.c:127 [inline] hif_usb_send+0x5f0/0x16f0 drivers/net/wireless/ath/ath9k/hif_usb.c:479 htc_issue_send drivers/net/wireless/ath/ath9k/htc_hst.c:34 [inline] htc_connect_service+0x143e/0x1960 drivers/net/wireless/ath/ath9k/htc_hst.c:275 ... Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] htc_connect_service+0x1029/0x1960 drivers/net/wireless/ath/ath9k/htc_hst.c:258 ... Bytes 16-17 of 18 are uninitialized Memory access of size 18 starts at ffff888027377e00

Gravité et risque d'exploitation

CVE-2022-49235 obtient un score CVSS de 5.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.28 %, ce qui la place devant 18.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <e352acdd378e9263cc4c6018e588f2dac7161d07, 5.15.33, <=5.17.*, 5.18, <5abf2b761b998063f5e2bae93fd4ab10e2a80f10, <0b700f7d06492de34964b6f414120043364f8191, <7da6169b6ebb75816b57be3beb829afa74f3b4b6, 0, <11f11ac281f0c0b363d2940204f28bae0422ed71, <ee4222052a76559c20e821bc3519cefb58b6d3e9, <5c2a6a8daa17a3f65b38b9a5574bb362c13fa1d9, <d1e0df1c57bd30871dd1c855742a7c346dbca853, <=4.9.*, <=5.10.*, 4.9.311, <=4.14.*, 5.4.189, <=5.4.*, <=4.19.*, fb9987d0f748c983bb795a86f47522313f701a08, <2.6.35, 5.16.19, <=5.16.*, 5.10.110, 4.14.276, 5.17.2, <=*, 4.19.238, <=5.15.*, <4d244b731188e0b63fc40a9d2dec72e9181fb37c, 2.6.35) 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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