CVE-2025-39683 (GCVE-0-2025-39683)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2025-11-03 17:42
VLAI?
Title
tracing: Limit access to parser->buffer when trace_get_user failed
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Limit access to parser->buffer when trace_get_user failed When the length of the string written to set_ftrace_filter exceeds FTRACE_BUFF_MAX, the following KASAN alarm will be triggered: BUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0 Read of size 1 at addr ffff0000d00bd5ba by task ash/165 CPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x34/0x50 (C) dump_stack_lvl+0xa0/0x158 print_address_description.constprop.0+0x88/0x398 print_report+0xb0/0x280 kasan_report+0xa4/0xf0 __asan_report_load1_noabort+0x20/0x30 strsep+0x18c/0x1b0 ftrace_process_regex.isra.0+0x100/0x2d8 ftrace_regex_release+0x484/0x618 __fput+0x364/0xa58 ____fput+0x28/0x40 task_work_run+0x154/0x278 do_notify_resume+0x1f0/0x220 el0_svc+0xec/0xf0 el0t_64_sync_handler+0xa0/0xe8 el0t_64_sync+0x1ac/0x1b0 The reason is that trace_get_user will fail when processing a string longer than FTRACE_BUFF_MAX, but not set the end of parser->buffer to 0. Then an OOB access will be triggered in ftrace_regex_release-> ftrace_process_regex->strsep->strpbrk. We can solve this problem by limiting access to parser->buffer when trace_get_user failed.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 634684d79733124f7470b226b0f42aada4426b07 , < b842ef39c2ad6156c13afdec25ecc6792a9b67b9 (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 41b838420457802f21918df66764b6fbf829d330 (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 418b448e1d7470da9d4d4797f71782595ee69c49 (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 58ff8064cb4c7eddac4da1a59da039ead586950a (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < d0c68045b8b0f3737ed7bd6b8c83b7887014adee (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 3079517a5ba80901fe828a06998da64b9b8749be (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 6a909ea83f226803ea0e718f6e88613df9234d58 (git)
Affected: 24cd31752f47699b89b4b3471155c8e599a1a23a (git)
Affected: e9cb474de7ff7a970c2a3951c12ec7e3113c0c35 (git)
Affected: 6ab671191f64b0da7d547e2ad4dc199ca7e5b558 (git)
Affected: 3d9281a4ac7171c808f9507f0937eb236b353905 (git)
Affected: 0b641b25870f02e2423e494365fc5243cc1e2759 (git)
Affected: ffd51dbfd2900e50c71b5c069fe407957e52d61f (git)
Affected: cdd107d7f18158d966c2bc136204fe826dac445c (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Limit access to parser-\u003ebuffer when trace_get_user failed\n\nWhen the length of the string written to set_ftrace_filter exceeds\nFTRACE_BUFF_MAX, the following KASAN alarm will be triggered:\n\nBUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0\nRead of size 1 at addr ffff0000d00bd5ba by task ash/165\n\nCPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty\nHardware name: linux,dummy-virt (DT)\nCall trace:\n show_stack+0x34/0x50 (C)\n dump_stack_lvl+0xa0/0x158\n print_address_description.constprop.0+0x88/0x398\n print_report+0xb0/0x280\n kasan_report+0xa4/0xf0\n __asan_report_load1_noabort+0x20/0x30\n strsep+0x18c/0x1b0\n ftrace_process_regex.isra.0+0x100/0x2d8\n ftrace_regex_release+0x484/0x618\n __fput+0x364/0xa58\n ____fput+0x28/0x40\n task_work_run+0x154/0x278\n do_notify_resume+0x1f0/0x220\n el0_svc+0xec/0xf0\n el0t_64_sync_handler+0xa0/0xe8\n el0t_64_sync+0x1ac/0x1b0\n\nThe reason is that trace_get_user will fail when processing a string\nlonger than FTRACE_BUFF_MAX, but not set the end of parser-\u003ebuffer to 0.\nThen an OOB access will be triggered in ftrace_regex_release-\u003e\nftrace_process_regex-\u003estrsep-\u003estrpbrk. We can solve this problem by\nlimiting access to parser-\u003ebuffer when trace_get_user failed."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330"
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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