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TI-2026-33716 Aliases CVE-2026-45991GHSA-x889-prf3-g3vg

udf: fix partition descriptor append bookkeeping

Priority LOW 35CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 23 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: udf: fix partition descriptor append bookkeeping Mounting a crafted UDF image with repeated partition descriptors can trigger a heap out-of-bounds write in part_descs_loc[]. handle_partition_descriptor() deduplicates entries by partition number, but appended slots never record partnum. As a result duplicate Partition Descriptors are appended repeatedly and num_part_descs keeps growing. Once the table is full, the growth path still sizes the allocation from partnum even though inserts are indexed by num_part_descs. If partnum is already aligned to PART_DESC_ALLOC_STEP, ALIGN(partnum, step) can keep the old capacity and the next append writes past the end of the table. Store partnum in the appended slot and size growth from the next append count so deduplication and capacity tracking follow the same model.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00177 7th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.19, 5.10.259, 5.15.210 +6Red Hat: 7 advisoriesRed Hat: 23 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux4.18.7 to before 4.194.19Patch availableCNA
LinuxLinux4.19 and later5.10.259, 5.15.210, 6.1.176, 6.6.140, 6.12.88, 6.18.57, 7.0.4, 7.1Patch availableCNA
  • Linux VendorLinux Affected 4.18.7 to before 4.19 Fixed in 4.19 Patch available CNA
  • Linux VendorLinux Affected 4.19 and later Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.140, 6.12.88, 6.18.57, 7.0.4, 7.1 Patch available CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.18.7 to before 4.19; 4.19.1 to before 6.6.140; 6.7 to before 6.12.88; 6.13 to before 7.0.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:-:*:*:*:*:*:*4.19VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc2:*:*:*:*:*:*4.19 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc3:*:*:*:*:*:*4.19 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc4:*:*:*:*:*:*4.19 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc5:*:*:*:*:*:*4.19 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc6:*:*:*:*:*:*4.19 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc7:*:*:*:*:*:*4.19 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:4.19:rc8:*:*:*:*:*:*4.19 rc8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.18.7 to before 4.19; 4.19.1 to before 6.6.140; 6.7 to before 6.12.88; 6.13 to before 7.0.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:-:*:*:*:*:*:* Versions 4.19 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc2:*:*:*:*:*:* Versions 4.19 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc3:*:*:*:*:*:* Versions 4.19 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc4:*:*:*:*:*:* Versions 4.19 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc5:*:*:*:*:*:* Versions 4.19 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc6:*:*:*:*:*:* Versions 4.19 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc7:*:*:*:*:*:* Versions 4.19 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:4.19:rc8:*:*:*:*:*:* Versions 4.19 rc8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 4.19
  • Fix · CNA Linux (Linux) Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.140, 6.12.88, 6.18.57, 7.0.4, 7.1

Red Hat 7 advisories

  • RHSA-2026:77634 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.109.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.109.1.el10_0, kernel-64k-devel-6.12.0-55.109.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.109.1.el10_0, kernel-64k-6.12.0-55.109.1.el10_0, kernel-64k-core-6.12.0-55.109.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.109.1.el10_0, libperf-6.12.0-55.109.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.109.1.el10_0, kernel-rt-64k-6.12.0-55.109.1.el10_0, kernel-rt-64k-core-6.12.0-55.109.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.109.1.el10_0, kernel-rt-core-6.12.0-55.109.1.el10_0, kernel-rt-debug-6.12.0-55.109.1.el10_0 +11
  • RHSA-2026:77217 Released 2026-10-07 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.211.1.el8_4, kernel-4.18.0-305.211.1.el8_4, kernel-abi-stablelists-4.18.0-305.211.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.211.1.el8_4, kernel-4.18.0-305.211.1.el8_4, kernel-abi-stablelists-4.18.0-305.211.1.el8_4 +19
  • RHSA-2026:77216 Released 2026-10-07 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.220.1.el8_6, kernel-4.18.0-372.220.1.el8_6, kernel-abi-stablelists-4.18.0-372.220.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.220.1.el8_6, kernel-4.18.0-372.220.1.el8_6, kernel-abi-stablelists-4.18.0-372.220.1.el8_6 +19
Show 4 more Red Hat advisories
  • RHSA-2026:57252 Released 2026-08-20 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.41.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.41.1.el9_8, kernel-64k-devel-5.14.0-687.41.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.41.1.el9_8, kernel-64k-5.14.0-687.41.1.el9_8, kernel-64k-core-5.14.0-687.41.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.41.1.el9_8, libperf-5.14.0-687.41.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.41.1.el9_8, kernel-rt-64k-5.14.0-687.41.1.el9_8, kernel-rt-64k-core-5.14.0-687.41.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.41.1.el9_8, kernel-rt-core-5.14.0-687.41.1.el9_8, kernel-rt-debug-5.14.0-687.41.1.el9_8 +9
  • RHSA-2026:57251 Released 2026-08-20 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.49.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.49.1.el10_2, kernel-64k-devel-6.12.0-211.49.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.49.1.el10_2, kernel-64k-6.12.0-211.49.1.el10_2, kernel-64k-core-6.12.0-211.49.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.49.1.el10_2, libperf-6.12.0-211.49.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.49.1.el10_2, kernel-rt-64k-6.12.0-211.49.1.el10_2, kernel-rt-64k-core-6.12.0-211.49.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.49.1.el10_2, kernel-rt-core-6.12.0-211.49.1.el10_2, kernel-rt-debug-6.12.0-211.49.1.el10_2 +9
  • RHSA-2026:54246 Released 2026-08-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.155.1.el8_10, kernel-4.18.0-553.155.1.el8_10, kernel-abi-stablelists-4.18.0-553.155.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.155.1.el8_10
  • RHSA-2026:54247 Released 2026-08-12 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.155.1.rt7.496.el8_10, kernel-rt-core-4.18.0-553.155.1.rt7.496.el8_10, kernel-rt-debug-4.18.0-553.155.1.rt7.496.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.155.1.rt7.496.el8_10, kernel-rt-core-4.18.0-553.155.1.rt7.496.el8_10, kernel-rt-debug-4.18.0-553.155.1.rt7.496.el8_10 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6Affected—
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:54246
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:77217
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:77216
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:77217
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:77216
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:54246
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:54247
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:54247
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:77634
Not affected: 1 product
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45991
  2. 2026-10-03 Alias added: GHSA-x889-prf3-g3vg
  3. 2026-10-07 Fix available: RHSA-2026:77216 · Red Hat
  4. 2026-10-07 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) · Red Hat
  5. 2026-10-07 Fix available: RHSA-2026:77217 · Red Hat
  6. 2026-10-07 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) · Red Hat
  7. 2026-10-09 Fix available: RHSA-2026:77634 · Red Hat
  8. 2026-10-09 Fix available: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) +2 · Red Hat
  9. 2026-10-15 Fix available: Linux/[email protected], Linux/Linux@73df74544b55241dca5dd788523e6f5f10bd2b9b · CNA
  10. 2026-10-15 1 new reference · CNA
  11. 2026-10-16 CISA SSVC decision points changed
  12. 2026-10-19 Weakness changed · CISA ADP

References

Patch 4

Other 4

  • 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