CVE-2024-56584None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: io_uring/tctx: work around xa_store() allocation error issue syzbot triggered the following WARN_ON: WARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xf…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
io_uring/tctx: work around xa_store() allocation error issue
syzbot triggered the following WARN_ON:
WARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51
which is the
WARN_ON_ONCE(!xa_empty(&tctx->xa));
sanity check in __io_uring_free() when a io_uring_task is going through its final put. The syzbot test case includes injecting memory allocation failures, and it very much looks like xa_store() can fail one of its memory allocations and end up with ->head being non-NULL even though no entries exist in the xarray.
Until this issue gets sorted out, work around it by attempting to iterate entries in our xarray, and WARN_ON_ONCE() if one is found.
Linux >= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < e05c070b401f6365c503e2b59f091331965c4fb9Linux >= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < 3a84fa784710990964c1e35df743851ab2863898Linux >= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < 94ad56f61b873ffeebcc620d451eacfbdf9d40f0Linux >= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < 42882b583095dcf747da6e3af1daeff40e27033eLinux >= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < d5b2ddf1f90c7248eff9630b95895c8950f2f36dLinux >= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < 7eb75ce7527129d7f1fee6951566af409a37a1c4Linux 5.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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