rhsa-2025:15472
Vulnerability from csaf_redhat
Published
2025-09-08 15:06
Modified
2025-09-17 07:28
Summary
Red Hat Security Advisory: kernel-rt security update

Notes

Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: bpf: Don't use tnum_range on array range checking for poke descriptors (CVE-2022-49985) * kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() (CVE-2025-38352) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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        "name": "Out-of-bounds Write"
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      "discovery_date": "2025-06-18T00:00:00+00:00",
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          "text": "2373540"
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don\u0027t use tnum_range on array range checking for poke descriptors\n\nHsin-Wei reported a KASAN splat triggered by their BPF runtime fuzzer which\nis based on a customized syzkaller:\n\n  BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x1257/0x13f0\n  Read of size 8 at addr ffff888004e90b58 by task syz-executor.0/1489\n  CPU: 1 PID: 1489 Comm: syz-executor.0 Not tainted 5.19.0 #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n  1.13.0-1ubuntu1.1 04/01/2014\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x9c/0xc9\n   print_address_description.constprop.0+0x1f/0x1f0\n   ? bpf_int_jit_compile+0x1257/0x13f0\n   kasan_report.cold+0xeb/0x197\n   ? kvmalloc_node+0x170/0x200\n   ? bpf_int_jit_compile+0x1257/0x13f0\n   bpf_int_jit_compile+0x1257/0x13f0\n   ? arch_prepare_bpf_dispatcher+0xd0/0xd0\n   ? rcu_read_lock_sched_held+0x43/0x70\n   bpf_prog_select_runtime+0x3e8/0x640\n   ? bpf_obj_name_cpy+0x149/0x1b0\n   bpf_prog_load+0x102f/0x2220\n   ? __bpf_prog_put.constprop.0+0x220/0x220\n   ? find_held_lock+0x2c/0x110\n   ? __might_fault+0xd6/0x180\n   ? lock_downgrade+0x6e0/0x6e0\n   ? lock_is_held_type+0xa6/0x120\n   ? __might_fault+0x147/0x180\n   __sys_bpf+0x137b/0x6070\n   ? bpf_perf_link_attach+0x530/0x530\n   ? new_sync_read+0x600/0x600\n   ? __fget_files+0x255/0x450\n   ? lock_downgrade+0x6e0/0x6e0\n   ? fput+0x30/0x1a0\n   ? ksys_write+0x1a8/0x260\n   __x64_sys_bpf+0x7a/0xc0\n   ? syscall_enter_from_user_mode+0x21/0x70\n   do_syscall_64+0x3b/0x90\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n  RIP: 0033:0x7f917c4e2c2d\n\nThe problem here is that a range of tnum_range(0, map-\u003emax_entries - 1) has\nlimited ability to represent the concrete tight range with the tnum as the\nset of resulting states from value + mask can result in a superset of the\nactual intended range, and as such a tnum_in(range, reg-\u003evar_off) check may\nyield true when it shouldn\u0027t, for example tnum_range(0, 2) would result in\n00XX -\u003e v = 0000, m = 0011 such that the intended set of {0, 1, 2} is here\nrepresented by a less precise superset of {0, 1, 2, 3}. As the register is\nknown const scalar, really just use the concrete reg-\u003evar_off.value for the\nupper index check.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: bpf: Don\u0027t use tnum_range on array range checking for poke descriptors",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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      "title": "kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()"
    }
  ]
}


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