CVE-2025-40253 (GCVE-0-2025-40253)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2026-10-15 22:02
VLAI
Title
s390/ctcm: Fix double-kfree
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/ctcm: Fix double-kfree The function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally from function 'ctcmpc_unpack_skb'. It frees passed mpcginfo. After that a call to function 'kfree' in function 'ctcmpc_unpack_skb' frees it again. Remove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'. Bug detected by the clang static analyzer.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:58 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 467ddbbe7e749d558f13e640f50f546149c930b3 , < 06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2 (git)
Affected: 4d3c6d741816539b57fa1110c3f765a8c176d7b4 , < 6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17a (git)
Affected: 2bd57101c3ecf3f8c0da1d26c2b6ad511adc6d50 , < 7616e2eee679746d526c7f5befd4eedb995935b5 (git)
Affected: 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a , < 43096dab8cc60fc39133205fd149a54d3acebea8 (git)
Affected: 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a , < 3b177b2ded563df16f6d5920671ffcfe5915d472 (git)
Affected: 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a , < b9dbfb1b5699f9f1e4991f96741bdf9047147589 (git)
Affected: 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a , < 7ff76f8dc6b550f8d16487bf3cebc278be720b5c (git)
Affected: 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a , < da02a1824884d6c84c5e5b5ac373b0c9e3288ec2 (git)
Affected: 36933de59f67029e5739a98393891f9b94f27e0f (git)
Affected: d886b4292a1c5b4facdb2dfdc31f0fecc71df898 (git)
Affected: 4c9ba0fed125deba8416b995b0c274b0804c0c24 (git)
Affected: ea0053af5dab4d63a9c44563973fb2f3bfd9eb2b (git)
Affected: 5.4.195 , < 5.4.302 (semver)
Affected: 5.10.117 , < 5.10.247 (semver)
Affected: 5.15.41 , < 5.15.197 (semver)
Affected: 4.9.315 , < 4.10 (semver)
Affected: 4.14.280 , < 4.15 (semver)
Affected: 4.19.244 , < 4.20 (semver)
Affected: 5.17.9 , < 5.18 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ctcm: Fix double-kfree\n\nThe function \u0027mpc_rcvd_sweep_req(mpcginfo)\u0027 is called conditionally\nfrom function \u0027ctcmpc_unpack_skb\u0027. It frees passed mpcginfo.\nAfter that a call to function \u0027kfree\u0027 in function \u0027ctcmpc_unpack_skb\u0027\nfrees it again.\n\nRemove \u0027kfree\u0027 call in function \u0027mpc_rcvd_sweep_req(mpcginfo)\u0027.\n\nBug detected by the clang static analyzer."
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              "value": "AV:A - The malicious `TH_SWEEP_REQ` transmission header is delivered as a link-level MPC frame by the directly-attached CTC peer (a partner LPAR or a z/VM guest coupled via virtual CTCA), reaching `ctcmpc_unpack_skb()` straight from the channel read interrupt. MPC TH headers are regenerated per link and not routable, so the attacker must sit on the adjacent channel connection rather than across a routed network.\nAC:L - A single frame with `th_ch_flag = 0xfe` deterministically drives `ctcmpc_unpack_skb()` into `mpc_rcvd_sweep_req()` and the two consecutive `kfree()` calls every time \u2014 no race, no timing window, and no memory-layout precondition outside the attacker\u0027s control.\nPR:N - The attacker needs no account, credential, or capability on the target Linux image; it only has to be the CTC peer, and the path is reachable both in `MPCG_STATE_READY` and during the pre-establishment XID-negotiation states, where no authentication of any kind has occurred.\nUI:N - The remote peer triggers the double free entirely on its own by transmitting one frame on an already-active CTC link; no administrator or user action on the victim system is needed at attack time.\nS:U - The slab corruption occurs in the receiving kernel\u0027s own softirq/tasklet context and its consequences stay within that kernel\u0027s security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - On kernels without freelist hardening the double free leaves the kmalloc-64 percpu freelist self-referential, so repeated allocations hand the same 40-byte object to unrelated kernel structures, yielding an aliasing/use-after-free primitive that exposes arbitrary kernel memory contents to the attacker-controlled objects.\nI:H - The same freelist corruption lets attacker-influenced allocations overlap live kernel objects (type confusion), giving a write primitive over adjacent/aliased kernel data and a realistic path to control-flow hijack \u2014 classic exploitable heap corruption, not a mere accounting error.\nA:H - With `CONFIG_SLAB_FREELIST_HARDENED` the immediate double free hits `BUG_ON(object == fp)` in `set_freepointer()` inside a tasklet, which is fatal in interrupt context; without it the corrupted freelist causes near-certain crashes, and either outcome is re-triggerable at will by the peer."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ctcm: Fix double-kfree\n\nThe function \u0027mpc_rcvd_sweep_req(mpcginfo)\u0027 is called conditionally\nfrom function \u0027ctcmpc_unpack_skb\u0027. It frees passed mpcginfo.\nAfter that a call to function \u0027kfree\u0027 in function \u0027ctcmpc_unpack_skb\u0027\nfrees it again.\n\nRemove \u0027kfree\u0027 call in function \u0027mpc_rcvd_sweep_req(mpcginfo)\u0027.\n\nBug detected by the clang static analyzer."
          },
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ns390/ctcm: Correcci\u00f3n de doble kfree\n\nLa funci\u00f3n \u0027mpc_rcvd_sweep_req(mpcginfo)\u0027 es llamada condicionalmente desde la funci\u00f3n \u0027ctcmpc_unpack_skb\u0027. Libera el mpcginfo pasado. Despu\u00e9s de eso, una llamada a la funci\u00f3n \u0027kfree\u0027 en la funci\u00f3n \u0027ctcmpc_unpack_skb\u0027 lo libera de nuevo.\n\nEliminar la llamada a \u0027kfree\u0027 en la funci\u00f3n \u0027mpc_rcvd_sweep_req(mpcginfo)\u0027.\n\nError detectado por el analizador est\u00e1tico de clang."
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        "id": "CVE-2025-40253",
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                  "value": "AV:A - The malicious `TH_SWEEP_REQ` transmission header is delivered as a link-level MPC frame by the directly-attached CTC peer (a partner LPAR or a z/VM guest coupled via virtual CTCA), reaching `ctcmpc_unpack_skb()` straight from the channel read interrupt. MPC TH headers are regenerated per link and not routable, so the attacker must sit on the adjacent channel connection rather than across a routed network.\nAC:L - A single frame with `th_ch_flag = 0xfe` deterministically drives `ctcmpc_unpack_skb()` into `mpc_rcvd_sweep_req()` and the two consecutive `kfree()` calls every time \u2014 no race, no timing window, and no memory-layout precondition outside the attacker\u0027s control.\nPR:N - The attacker needs no account, credential, or capability on the target Linux image; it only has to be the CTC peer, and the path is reachable both in `MPCG_STATE_READY` and during the pre-establishment XID-negotiation states, where no authentication of any kind has occurred.\nUI:N - The remote peer triggers the double free entirely on its own by transmitting one frame on an already-active CTC link; no administrator or user action on the victim system is needed at attack time.\nS:U - The slab corruption occurs in the receiving kernel\u0027s own softirq/tasklet context and its consequences stay within that kernel\u0027s security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - On kernels without freelist hardening the double free leaves the kmalloc-64 percpu freelist self-referential, so repeated allocations hand the same 40-byte object to unrelated kernel structures, yielding an aliasing/use-after-free primitive that exposes arbitrary kernel memory contents to the attacker-controlled objects.\nI:H - The same freelist corruption lets attacker-influenced allocations overlap live kernel objects (type confusion), giving a write primitive over adjacent/aliased kernel data and a realistic path to control-flow hijack \u2014 classic exploitable heap corruption, not a mere accounting error.\nA:H - With `CONFIG_SLAB_FREELIST_HARDENED` the immediate double free hits `BUG_ON(object == fp)` in `set_freepointer()` inside a tasklet, which is fatal in interrupt context; without it the corrupted freelist causes near-certain crashes, and either outcome is re-triggerable at will by the peer."
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  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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