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Permalink CVE-2026-64004
7.8 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): High (H)
  • Integrity (I): High (H)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): Low (L)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): High (H)
created 5 days, 20 hours ago Activity log
  • Created & dismissed (max. allowed matches exceeded) suggestion
net/iucv: fix locking in .getsockopt

In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.

Affected products

Linux
  • <cd691beafea0dd779e69e81ccc26b0ab50efcb5e
  • <884eb247b74d86db97e3a37f0d6fc8e1e83590dd
  • =<6.18.*
  • <3.4
  • <9817369243380e287ebe5525411557eaa3aa2a79
  • =<7.0.*
  • =<5.15.*
  • =<6.12.*
  • <69554adc7a6fa04ede3ad7512321d83748e3c920
  • =<6.1.*
  • <1fc30bd4e55e2dd622d2d366cecd732c1841bbee
  • <3589d20a666caf30ad100c960a2de7de390fce88
  • =<6.6.*
  • =<*
  • <6e792b8dd3002bbc4136745928a9605df1a72b8a
  • ==3.4
  • <45bb8de8c95d8899f4b8f61bd9bceb8132af73cb
  • =<5.10.*