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Ubuntu: (Multiple Advisories) (CVE-2024-27005): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2024-27005): Linux kernel vulnerabilities

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/01/2024
Created
07/12/2024
Added
07/12/2024
Modified
07/17/2024

Description

In the Linux kernel, the following vulnerability has been resolved: interconnect: Don't access req_list while it's being manipulated The icc_lock mutex was split into separate icc_lock and icc_bw_lock mutexes in [1] to avoid lockdep splats. However, this didn't adequately protect access to icc_node::req_list. The icc_set_bw() function will eventually iterate over req_list while only holding icc_bw_lock, but req_list can be modified while only holding icc_lock. This causes races between icc_set_bw(), of_icc_get(), and icc_put(). Example A: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); icc_put(path_b) mutex_lock(&icc_lock); aggregate_requests() hlist_for_each_entry(r, ... hlist_del(... <r = invalid pointer> Example B: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); path_b = of_icc_get() of_icc_get_by_index() mutex_lock(&icc_lock); path_find() path_init() aggregate_requests() hlist_for_each_entry(r, ... hlist_add_head(... <r = invalid pointer> Fix this by ensuring icc_bw_lock is always held before manipulating icc_node::req_list. The additional places icc_bw_lock is held don't perform any memory allocations, so we should still be safe from the original lockdep splats that motivated the separate locks. [1] commit af42269c3523 ("interconnect: Fix locking for runpm vs reclaim")

Solution(s)

  • ubuntu-upgrade-linux-image-6-8-0-1006-gke
  • ubuntu-upgrade-linux-image-6-8-0-1007-intel
  • ubuntu-upgrade-linux-image-6-8-0-1007-raspi
  • ubuntu-upgrade-linux-image-6-8-0-1008-ibm
  • ubuntu-upgrade-linux-image-6-8-0-1008-oem
  • ubuntu-upgrade-linux-image-6-8-0-1009-nvidia
  • ubuntu-upgrade-linux-image-6-8-0-1009-nvidia-64k
  • ubuntu-upgrade-linux-image-6-8-0-1010-azure
  • ubuntu-upgrade-linux-image-6-8-0-1010-azure-fde
  • ubuntu-upgrade-linux-image-6-8-0-1010-gcp
  • ubuntu-upgrade-linux-image-6-8-0-38-generic
  • ubuntu-upgrade-linux-image-6-8-0-38-generic-64k
  • ubuntu-upgrade-linux-image-6-8-0-38-lowlatency
  • ubuntu-upgrade-linux-image-6-8-0-38-lowlatency-64k
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-azure-fde
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-64k
  • ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
  • ubuntu-upgrade-linux-image-generic-hwe-24-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-ibm
  • ubuntu-upgrade-linux-image-ibm-classic
  • ubuntu-upgrade-linux-image-ibm-lts-24-04
  • ubuntu-upgrade-linux-image-intel
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-64k
  • ubuntu-upgrade-linux-image-nvidia
  • ubuntu-upgrade-linux-image-nvidia-64k
  • ubuntu-upgrade-linux-image-oem-24-04
  • ubuntu-upgrade-linux-image-oem-24-04a
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-24-04

References

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