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Fencer Intel
medium 4.9

CVE-2011-2695 json

Multiple off-by-one errors in the ext4 subsystem in the Linux kernel before 3.0-rc5 allow local users to cause a denial of service (BUG_ON…

published 2011-07-28 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2676

cvss
4.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

Multiple off-by-one errors in the ext4 subsystem in the Linux kernel before 3.0-rc5 allow local users to cause a denial of service (BUG_ON and system crash) by accessing a sparse file in extent format with a write operation involving a block number corresponding to the largest possible 32-bit unsigned integer.

Patch / fix

  • linux linux_kernel 3.0
  • kernel RHEL 5 2.6.18-274.7.1.el5
  • kernel-PAE RHEL 5 2.6.18-274.7.1.el5
  • kernel-xen RHEL 5 2.6.18-274.7.1.el5
  • kernel-kdump RHEL 5 2.6.18-274.7.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-274.7.1.el5
  • kernel RHEL 6 2.6.32-131.12.1.el6
  • perf RHEL 6 2.6.32-131.12.1.el6
  • kernel-kdump RHEL 6 2.6.32-131.12.1.el6

red hat advisories RHSA-2011:1386RHSA-2011:1189RHSA-2011:1253

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-2695 updated cvss 4.9

kernel: ext4: kernel panic when writing data to the last block of sparse file

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.7.1.el5, kernel-PAE 2.6.18-274.7.1.el5, kernel-xen 2.6.18-274.7.1.el5, kernel-kdump 2.6.18-274.7.1.el5, kernel-debuginfo-common 2.6.18-274.7.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.7.1.el5, kernel-PAE 2.6.18-274.7.1.el5, kernel-xen 2.6.18-274.7.1.el5, kernel-debuginfo-common 2.6.18-274.7.1.el5
    fixed: vendor fix RHSA-2011:1386
  • Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-131.12.1.el6, kernel 2.6.32-131.12.1.el6, kernel-kdump 2.6.32-131.12.1.el6, kernel-firmware 2.6.32-131.12.1.el6, kernel-bootwrapper 2.6.32-131.12.1.el6, kernel-debuginfo-common-i686 2.6.32-131.12.1.el6, +3 more
    fixed: vendor fix RHSA-2011:1189
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 2.6.33.9-rt31.75.el6rt, kernel-rt-trace 2.6.33.9-rt31.75.el6rt, kernel-rt-vanilla 2.6.33.9-rt31.75.el6rt, kernel-rt-firmware 2.6.33.9-rt31.75.el6rt, kernel-rt-debuginfo-common-x86_64 2.6.33.9-rt31.75.el6rt
    fixed: vendor fix RHSA-2011:1253
  • Red Hat Enterprise Linux (v. 5 server) kernel-headers 2.6.18-274.7.1.el5 Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux Desktop (v. 5 client) kernel-headers 2.6.18-274.7.1.el5
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • spinics.net http://www.spinics.net/lists/linux-ext4/msg25697.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.