CVE-2024-35852 (GCVE-0-2024-35852)

Vulnerability from cvelistv5 – Published: 2024-05-17 14:47 – Updated: 2025-05-04 09:06
VLAI?
Title
mlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work
Summary
In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work The rehash delayed work is rescheduled with a delay if the number of credits at end of the work is not negative as supposedly it means that the migration ended. Otherwise, it is rescheduled immediately. After "mlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash" the above is no longer accurate as a non-negative number of credits is no longer indicative of the migration being done. It can also happen if the work encountered an error in which case the migration will resume the next time the work is scheduled. The significance of the above is that it is possible for the work to be pending and associated with hints that were allocated when the migration started. This leads to the hints being leaked [1] when the work is canceled while pending as part of ACL region dismantle. Fix by freeing the hints if hints are associated with a work that was canceled while pending. Blame the original commit since the reliance on not having a pending work associated with hints is fragile. [1] unreferenced object 0xffff88810e7c3000 (size 256): comm "kworker/0:16", pid 176, jiffies 4295460353 hex dump (first 32 bytes): 00 30 95 11 81 88 ff ff 61 00 00 00 00 00 00 80 .0......a....... 00 00 61 00 40 00 00 00 00 00 00 00 04 00 00 00 ..a.@........... backtrace (crc 2544ddb9): [<00000000cf8cfab3>] kmalloc_trace+0x23f/0x2a0 [<000000004d9a1ad9>] objagg_hints_get+0x42/0x390 [<000000000b143cf3>] mlxsw_sp_acl_erp_rehash_hints_get+0xca/0x400 [<0000000059bdb60a>] mlxsw_sp_acl_tcam_vregion_rehash_work+0x868/0x1160 [<00000000e81fd734>] process_one_work+0x59c/0xf20 [<00000000ceee9e81>] worker_thread+0x799/0x12c0 [<00000000bda6fe39>] kthread+0x246/0x300 [<0000000070056d23>] ret_from_fork+0x34/0x70 [<00000000dea2b93e>] ret_from_fork_asm+0x1a/0x30
Severity ?
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < 51cefc9da400b953fee749c9e5d26cd4a2b5d758 (git)
Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < 857ed800133ffcfcee28582090b63b0cbb8ba59d (git)
Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < 63d814d93c5cce4c18284adc810028f28dca493f (git)
Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < 5bfe7bf9656ed2633718388f12b7c38b86414a04 (git)
Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < de1aaefa75be9d0ec19c9a3e0e2f9696de20c6ab (git)
Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < d72dd6fcd7886d0523afbab8b4a4b22d17addd7d (git)
Affected: c9c9af91f1d9a636aecc55302c792538e549a430 , < fb4e2b70a7194b209fc7320bbf33b375f7114bd5 (git)
Create a notification for this product.
    Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.4.275 , ≤ 5.4.* (semver)
Unaffected: 5.10.216 , ≤ 5.10.* (semver)
Unaffected: 5.15.158 , ≤ 5.15.* (semver)
Unaffected: 6.1.90 , ≤ 6.1.* (semver)
Unaffected: 6.6.30 , ≤ 6.6.* (semver)
Unaffected: 6.8.9 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

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\"bippy-a5840b7849dd\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work\\n\\nThe rehash delayed work is rescheduled with a delay if the number of\\ncredits at end of the work is not negative as supposedly it means that\\nthe migration ended. Otherwise, it is rescheduled immediately.\\n\\nAfter \\\"mlxsw: spectrum_acl_tcam: Fix possible use-after-free during\\nrehash\\\" the above is no longer accurate as a non-negative number of\\ncredits is no longer indicative of the migration being done. It can also\\nhappen if the work encountered an error in which case the migration will\\nresume the next time the work is scheduled.\\n\\nThe significance of the above is that it is possible for the work to be\\npending and associated with hints that were allocated when the migration\\nstarted. This leads to the hints being leaked [1] when the work is\\ncanceled while pending as part of ACL region dismantle.\\n\\nFix by freeing the hints if hints are associated with a work that was\\ncanceled while pending.\\n\\nBlame the original commit since the reliance on not having a pending\\nwork associated with hints is fragile.\\n\\n[1]\\nunreferenced object 0xffff88810e7c3000 (size 256):\\n  comm \\\"kworker/0:16\\\", pid 176, jiffies 4295460353\\n  hex dump (first 32 bytes):\\n    00 30 95 11 81 88 ff ff 61 00 00 00 00 00 00 80  .0......a.......\\n    00 00 61 00 40 00 00 00 00 00 00 00 04 00 00 00  ..a.@...........\\n  backtrace (crc 2544ddb9):\\n    [\u003c00000000cf8cfab3\u003e] kmalloc_trace+0x23f/0x2a0\\n    [\u003c000000004d9a1ad9\u003e] objagg_hints_get+0x42/0x390\\n    [\u003c000000000b143cf3\u003e] mlxsw_sp_acl_erp_rehash_hints_get+0xca/0x400\\n    [\u003c0000000059bdb60a\u003e] mlxsw_sp_acl_tcam_vregion_rehash_work+0x868/0x1160\\n    [\u003c00000000e81fd734\u003e] process_one_work+0x59c/0xf20\\n    [\u003c00000000ceee9e81\u003e] worker_thread+0x799/0x12c0\\n    [\u003c00000000bda6fe39\u003e] kthread+0x246/0x300\\n    [\u003c0000000070056d23\u003e] ret_from_fork+0x34/0x70\\n    [\u003c00000000dea2b93e\u003e] ret_from_fork_asm+0x1a/0x30\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:30:08.173Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35852\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-02T03:21:48.279Z\", \"dateReserved\": \"2024-05-17T13:50:33.106Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T14:47:29.441Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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