Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: fix signed comparison in io_poll_get_ownership() io_poll_get_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) atomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG (BIT(31)) is set in poll_refs, the value becomes negative in signed arithmetic, so the >= 128 comparison always evaluates to false and the slowpath is never taken. Fix this by casting the atomic_read() result to unsigned int before the comparison, so that the cancel flag is treated as a large positive value and correctly triggers the slowpath.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea before 81bf96b0abbfa4cd47ea32e12596aed3855fb2f3; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea before cf522703d4f194991615763697ae25a3f9539763; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea before fc47043f3d9af3efa407665b47f8378ec691ba18; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea before ea0697129807d718037f618221037aa0660ee3c5; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea before c6d191164dc81838d8dbf452a6000f68c558d1ae; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea before 326941b22806cbf2df1fbfe902b7908b368cce42; affected 4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048; affected bc4e6ee16778149811333a969a7a893d4cc110c5; affected 5.15.82 before 5.16; affected 6.0.11 before 6.1 |
| Linux / Linux | affected 6.1; unaffected 0 before 6.1; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3
- https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763
- https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18
- https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5
- https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae
- https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.