CVE-2022-49703 (GCVE-0-2022-49703)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-10-01 19:36
VLAI?
Title
scsi: ibmvfc: Store vhost pointer during subcrq allocation
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Store vhost pointer during subcrq allocation Currently the back pointer from a queue to the vhost adapter isn't set until after subcrq interrupt registration. The value is available when a queue is first allocated and can/should be also set for primary and async queues as well as subcrqs. This fixes a crash observed during kexec/kdump on Power 9 with legacy XICS interrupt controller where a pending subcrq interrupt from the previous kernel can be replayed immediately upon IRQ registration resulting in dereference of a garbage backpointer in ibmvfc_interrupt_scsi(). Kernel attempted to read user page (58) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x00000058 Faulting instruction address: 0xc008000003216a08 Oops: Kernel access of bad area, sig: 11 [#1] ... NIP [c008000003216a08] ibmvfc_interrupt_scsi+0x40/0xb0 [ibmvfc] LR [c0000000082079e8] __handle_irq_event_percpu+0x98/0x270 Call Trace: [c000000047fa3d80] [c0000000123e6180] 0xc0000000123e6180 (unreliable) [c000000047fa3df0] [c0000000082079e8] __handle_irq_event_percpu+0x98/0x270 [c000000047fa3ea0] [c000000008207d18] handle_irq_event+0x98/0x188 [c000000047fa3ef0] [c00000000820f564] handle_fasteoi_irq+0xc4/0x310 [c000000047fa3f40] [c000000008205c60] generic_handle_irq+0x50/0x80 [c000000047fa3f60] [c000000008015c40] __do_irq+0x70/0x1a0 [c000000047fa3f90] [c000000008016d7c] __do_IRQ+0x9c/0x130 [c000000014622f60] [0000000020000000] 0x20000000 [c000000014622ff0] [c000000008016e50] do_IRQ+0x40/0xa0 [c000000014623020] [c000000008017044] replay_soft_interrupts+0x194/0x2f0 [c000000014623210] [c0000000080172a8] arch_local_irq_restore+0x108/0x170 [c000000014623240] [c000000008eb1008] _raw_spin_unlock_irqrestore+0x58/0xb0 [c000000014623270] [c00000000820b12c] __setup_irq+0x49c/0x9f0 [c000000014623310] [c00000000820b7c0] request_threaded_irq+0x140/0x230 [c000000014623380] [c008000003212a50] ibmvfc_register_scsi_channel+0x1e8/0x2f0 [ibmvfc] [c000000014623450] [c008000003213d1c] ibmvfc_init_sub_crqs+0xc4/0x1f0 [ibmvfc] [c0000000146234d0] [c0080000032145a8] ibmvfc_reset_crq+0x150/0x210 [ibmvfc] [c000000014623550] [c0080000032147c8] ibmvfc_init_crq+0x160/0x280 [ibmvfc] [c0000000146235f0] [c00800000321a9cc] ibmvfc_probe+0x2a4/0x530 [ibmvfc]
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3034ebe26389740bb6b4a463e05afb51dc93c336 , < 8540f66196ca35b7b5e902932571c18b9fde0cd1 (git)
Affected: 3034ebe26389740bb6b4a463e05afb51dc93c336 , < 6d38e3b614ded59da8b95377a98df969a5a5627a (git)
Affected: 3034ebe26389740bb6b4a463e05afb51dc93c336 , < aeaadcde1a60138bceb65de3cdaeec78170b4459 (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.51 , ≤ 5.15.* (semver)
Unaffected: 5.18.8 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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The value is available when a\\nqueue is first allocated and can/should be also set for primary and async\\nqueues as well as subcrqs.\\n\\nThis fixes a crash observed during kexec/kdump on Power 9 with legacy XICS\\ninterrupt controller where a pending subcrq interrupt from the previous\\nkernel can be replayed immediately upon IRQ registration resulting in\\ndereference of a garbage backpointer in ibmvfc_interrupt_scsi().\\n\\nKernel attempted to read user page (58) - exploit attempt? (uid: 0)\\nBUG: Kernel NULL pointer dereference on read at 0x00000058\\nFaulting instruction address: 0xc008000003216a08\\nOops: Kernel access of bad area, sig: 11 [#1]\\n...\\nNIP [c008000003216a08] ibmvfc_interrupt_scsi+0x40/0xb0 [ibmvfc]\\nLR [c0000000082079e8] __handle_irq_event_percpu+0x98/0x270\\nCall Trace:\\n[c000000047fa3d80] [c0000000123e6180] 0xc0000000123e6180 (unreliable)\\n[c000000047fa3df0] [c0000000082079e8] __handle_irq_event_percpu+0x98/0x270\\n[c000000047fa3ea0] [c000000008207d18] handle_irq_event+0x98/0x188\\n[c000000047fa3ef0] [c00000000820f564] handle_fasteoi_irq+0xc4/0x310\\n[c000000047fa3f40] [c000000008205c60] generic_handle_irq+0x50/0x80\\n[c000000047fa3f60] [c000000008015c40] __do_irq+0x70/0x1a0\\n[c000000047fa3f90] [c000000008016d7c] __do_IRQ+0x9c/0x130\\n[c000000014622f60] [0000000020000000] 0x20000000\\n[c000000014622ff0] [c000000008016e50] do_IRQ+0x40/0xa0\\n[c000000014623020] [c000000008017044] replay_soft_interrupts+0x194/0x2f0\\n[c000000014623210] [c0000000080172a8] arch_local_irq_restore+0x108/0x170\\n[c000000014623240] [c000000008eb1008] _raw_spin_unlock_irqrestore+0x58/0xb0\\n[c000000014623270] [c00000000820b12c] __setup_irq+0x49c/0x9f0\\n[c000000014623310] [c00000000820b7c0] request_threaded_irq+0x140/0x230\\n[c000000014623380] [c008000003212a50] ibmvfc_register_scsi_channel+0x1e8/0x2f0 [ibmvfc]\\n[c000000014623450] [c008000003213d1c] ibmvfc_init_sub_crqs+0xc4/0x1f0 [ibmvfc]\\n[c0000000146234d0] [c0080000032145a8] ibmvfc_reset_crq+0x150/0x210 [ibmvfc]\\n[c000000014623550] [c0080000032147c8] ibmvfc_init_crq+0x160/0x280 [ibmvfc]\\n[c0000000146235f0] [c00800000321a9cc] ibmvfc_probe+0x2a4/0x530 [ibmvfc]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.51\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.8\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:43:36.625Z\"}}}",
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}


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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.



Detection rules are retrieved from Rulezet.