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CVE-2026-89880

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <3.15, 5.15.221, <f14a713a36a5c87568430e9770896f2a8f5bbbb7, <26a2a985bbeee3eaa6f80ff7de732161a171ec9f, 0, 5.10.270, <c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce, 6.1.188, 6.18.51, <=5.10.*, <=6.6.*, 7.2.5, 6.6.157, <0337ab0759285076a3f9dcfcc40906e69ab519b3, 3.15, <8bcf11a239eac4e224ad856277de9a36c91b1711, <=6.18.*, 771138920eafa399f68d3492c8a75dfeea23474b, 6.12.110, <=7.2.*, <=*, <=5.15.*, <c819dea3a433ae790b829443fdcc1715d1586560, <fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4, <ac02b2c56ccef0788cea9b86990a8f349a3fc6d8, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure rtl2832_sdr_start_streaming() calls rtl2832_sdr_alloc_stream_bufs(), rtl2832_sdr_alloc_urbs() and rtl2832_sdr_submit_urbs() in sequence and shares a single err: label that only unlocks the mutex and returns. When alloc_urbs() succeeds but submit_urbs() fails, or when alloc_urbs() itself returns -ENOMEM after alloc_stream_bufs() has already succeeded, the URBs and/or the coherent DMA stream buffers stay allocated while streaming reports failure to vb2. Two latent defects follow on the next VIDIOC_STREAMON: 1) rtl2832_sdr_alloc_stream_bufs() unconditionally resets dev->buf_num to 0 and overwrites dev->buf_list[]/dev->dma_addr[], permanently leaking the coherent DMA memory allocated by the previous attempt. 2) rtl2832_sdr_alloc_urbs() never resets dev->urbs_initialized and only increments it. After a second successful pass urbs_initialized can exceed MAX_BULK_BUFS, so the subsequent rtl2832_sdr_free_urbs() walks from urbs_initialized - 1 down to 0 and reads past the end of dev->urb_list[], passing garbage pointers to usb_free_urb(). Mirror the teardown that stop_streaming() already performs: on the error path call rtl2832_sdr_free_urbs() and rtl2832_sdr_free_stream_bufs() before unlocking. Both helpers are idempotent (free_urbs kills and zeros urbs_initialized; free_stream_bufs is gated on URB_BUF and clears the buf_num counter), so partial-failure paths and the no-allocation paths remain safe. Issue identified by automated review of the INV-003 series at https://sashiko.dev/

Gravité et risque d'exploitation

CVE-2026-89880 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <3.15, 5.15.221, <f14a713a36a5c87568430e9770896f2a8f5bbbb7, <26a2a985bbeee3eaa6f80ff7de732161a171ec9f, 0, 5.10.270, <c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce, 6.1.188, 6.18.51, <=5.10.*, <=6.6.*, 7.2.5, 6.6.157, <0337ab0759285076a3f9dcfcc40906e69ab519b3, 3.15, <8bcf11a239eac4e224ad856277de9a36c91b1711, <=6.18.*, 771138920eafa399f68d3492c8a75dfeea23474b, 6.12.110, <=7.2.*, <=*, <=5.15.*, <c819dea3a433ae790b829443fdcc1715d1586560, <fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4, <ac02b2c56ccef0788cea9b86990a8f349a3fc6d8, 7.3) 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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