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CVE-2009-4895

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6...

4.7 Medium

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.26%Down 1.0 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 4.7

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Record
CVE-2009-4895
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.7 MediumAV:L/AC:M/Au:N/C:N/I:N/A:C
Weakness
CWE-362, CWE-476
Updated
2026-11-02
CVE List No score

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Record
CVE-2009-4895
Updated
2026-11-02
EUVDEUVD-2009-4858 No score

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Record
EUVD-2009-4858
Updated
2026-11-03
GitHub AdvisoriesGHSA-cjgr-h69p-cj83 4.7

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6...

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Record
GHSA-cjgr-h69p-cj83
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-362
Updated
2026-11-02
OSVBELL-CVE-2009-4895 4.7

CVE-2009-4895 does not affect BellSoft software

Record
BELL-CVE-2009-4895
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
linux-2.6
Debian:5.0
From an advisory covering 9 CVEs
 before 2.6.26-24lenny1, plus listed versions
2.6.26-132.6.26-13lenny22.6.26-13lenny2~bpo40+12.6.26-142.6.26-15
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2.6.26-15lenny12.6.26-15lenny22.6.26-15lenny32.6.26-15~bpo40+12.6.26-15~bpo40+22.6.26-162.6.26-172.6.26-17lenny12.6.26-17lenny22.6.26-17lenny2~bpo40+12.6.26-17~bpo40+12.6.26-182.6.26-192.6.26-19lenny12.6.26-19lenny22.6.26-19~bpo40+12.6.26-202.6.26-20~bpo40+12.6.26-212.6.26-21lenny12.6.26-21lenny22.6.26-21lenny32.6.26-21lenny42.6.26-21~bpo40+12.6.26-222.6.26-22lenny12.6.26-232.6.26-24
2.6.26-24lenny1
kernel-rt
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debug
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debug-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debug-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debuginfo-common
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-doc
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-trace
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
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Affected packages
PackageAffectedFixed
kernel-rt-trace-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-trace-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-vanilla
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-vanilla-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-vanilla-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-4895 is a medium vulnerability (CVSS 4.7) in Debian Linux, published August 19, 2010. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 18th percentile. No source names a fixed version.

References

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