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In the Linux kernel, the following vulnerability has been resolved:
io_uring/sqpoll: zero sqd->thread on tctx errors
Syzkeller reports:
BUG: KASAN: slab-use-after-free in thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
Read of size 8 at addr ffff88803578c510 by task syz.2.3223/27552
Call Trace:
<TASK>
...
kasan_report+0x143/0x180 mm/kasan/report.c:602
thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
thread_group_cputime_adjusted+0xa6/0x340 kernel/sched/cputime.c:639
getrusage+0x1000/0x1340 kernel/sys.c:1863
io_uring_show_fdinfo+0xdfe/0x1770 io_uring/fdinfo.c:197
seq_show+0x608/0x770 fs/proc/fd.c:68
...
That's due to sqd->task not being cleared properly in cases where
SQPOLL task tctx setup fails, which can essentially only happen with
fault injection to insert allocation errors.
Metrics
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In the Linux kernel, the following vulnerability has been resolved:
io_uring/sqpoll: zero sqd->thread on tctx errors
Syzkeller reports:
BUG: KASAN: slab-use-after-free in thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
Read of size 8 at addr ffff88803578c510 by task syz.2.3223/27552
Call Trace:
<TASK>
...
kasan_report+0x143/0x180 mm/kasan/report.c:602
thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
thread_group_cputime_adjusted+0xa6/0x340 kernel/sched/cputim
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Removed
CVSS V3.1
CISA-ADP: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Removed
CWE
CISA-ADP: CWE-416
Removed
CPE Configuration
OR
*cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.9 up to (excluding) 6.12.10
OR
*cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.9 up to (excluding) 6.12.10
In the Linux kernel, the following vulnerability has been resolved:
io_uring/sqpoll: zero sqd->thread on tctx errors
Syzkeller reports:
BUG: KASAN: slab-use-after-free in thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
Read of size 8 at addr ffff88803578c510 by task syz.2.3223/27552
Call Trace:
<TASK>
...
kasan_report+0x143/0x180 mm/kasan/report.c:602
thread_group_cputime+0x409/0x700 kernel/sched/cputime.c:341
thread_group_cputime_adjusted+0xa6/0x340 kernel/sched/cputim