Read the docs
TI-2026-31251 Aliases CVE-2026-43071GHSA-977x-crv2-w57m

dcache: Limit the minimal number of bucket to two

Priority MEDIUM 46CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: dcache: Limit the minimal number of bucket to two There is an OOB read problem on dentry_hashtable when user sets 'dhash_entries=1': BUG: unable to handle page fault for address: ffff888b30b774b0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page Oops: Oops: 0000 [#1] SMP PTI RIP: 0010:__d_lookup+0x56/0x120 Call Trace: d_lookup.cold+0x16/0x5d lookup_dcache+0x27/0xf0 lookup_one_qstr_excl+0x2a/0x180 start_dirop+0x55/0xa0 simple_start_creating+0x8d/0xa0 debugfs_start_creating+0x8c/0x180 debugfs_create_dir+0x1d/0x1c0 pinctrl_init+0x6d/0x140 do_one_initcall+0x6d/0x3d0 kernel_init_freeable+0x39f/0x460 kernel_init+0x2a/0x260 There will be only one bucket in dentry_hashtable when dhash_entries is set as one, and d_hash_shift is calculated as 32 by dcache_init(). Then, following process will access more than one buckets(which memory region is not allocated) in dentry_hashtable: d_lookup b = d_hash(hash) dentry_hashtable + ((u32)hashlen >> d_hash_shift) // The C standard defines the behavior of right shift amounts // exceeding the bit width of the operand as undefined. The // result of '(u32)hashlen >> d_hash_shift' becomes 'hashlen', // so 'b' will point to an unallocated memory region. hlist_bl_for_each_entry_rcu(b) hlist_bl_first_rcu(head) h->first // read OOB! Fix it by limiting the minimal number of dentry_hashtable bucket to two, so that 'd_hash_shift' won't exceeds the bit width of type u32.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00459 39th percentileScored 2026-11-07
Fix Partial Linux (Linux): 3.11, 3.13, 3.15 +8Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux3.10.55 to before 3.11; 3.12.29 to before 3.13; 3.14.19 to before 3.15; 3.16.3 to before 3.173.11, 3.13, 3.15, 3.17Patch availableCNA
LinuxLinux3.17 and later6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1, 7.1Patch availableCNA
  • Linux VendorLinux Affected 3.10.55 to before 3.11; 3.12.29 to before 3.13; 3.14.19 to before 3.15; 3.16.3 to before 3.17 Fixed in 3.11, 3.13, 3.15, 3.17 Patch available CNA
  • Linux VendorLinux Affected 3.17 and later Fixed in 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1, 7.1 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.10.55 to before 3.11; 3.12.29 to before 3.13; 3.14.19 to before 3.15; 3.16.3 to before 3.17; 3.17.1 to before 6.1.175; 6.2 to before 6.6.136; 6.7 to before 6.12.83; 6.13 to before 6.18.24; 6.19 to before 6.19.14; 7.0 to before 7.0.1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.17:-:*:*:*:*:*:*3.17VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.17:rc5:*:*:*:*:*:*3.17 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.17:rc6:*:*:*:*:*:*3.17 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.17:rc7:*:*:*:*:*:*3.17 rc7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.10.55 to before 3.11; 3.12.29 to before 3.13; 3.14.19 to before 3.15; 3.16.3 to before 3.17; 3.17.1 to before 6.1.175; 6.2 to before 6.6.136; 6.7 to before 6.12.83; 6.13 to before 6.18.24; 6.19 to before 6.19.14; 7.0 to before 7.0.1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.17:-:*:*:*:*:*:* Versions 3.17 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.17:rc5:*:*:*:*:*:* Versions 3.17 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.17:rc6:*:*:*:*:*:* Versions 3.17 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.17:rc7:*:*:*:*:*:* Versions 3.17 rc7 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 3.11, 3.13, 3.15, 3.17
  • Fix · CNA Linux (Linux) Fixed in 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1, 7.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43071
  2. 2026-10-03 Alias added: GHSA-977x-crv2-w57m
  3. 2026-10-14 EPSS moved to the below the 50th percentile
  4. 2026-10-14 Priority changed: MEDIUM → LOW
  5. 2026-10-16 Priority changed: LOW → MEDIUM
  6. 2026-10-16 CISA SSVC decision points changed
  7. 2026-10-19 Weakness changed · CISA ADP

References

Patch 7

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences