01 Record

CVE-2023-53500

xfrm: fix slab-use-after-free in decode_session6

HighPUBLISHEDCNA: Linux

CNA base score7.3 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

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02 Description

xfrm: fix slab-use-after-free in decode_session6

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 5.2% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-15.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-10-01 11:45Z1 YR AGO

Last updated

2026-10-15 21:41Z13 DAYS AGO

Reserved

2025-10-01

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.3)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Weaknesses

CWE-416Use After FreeVariant

Data version

5.2

Document digest

41e31a682dbc09eca17230ee954657e765ea3aa55b80bb1f86fc8690de5fc34e

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxf855691975bb06373a98711e4cfe2c224244b536 to < da4cbaa75ed088b6d70db77b9103a27e2359e243, f855691975bb06373a98711e4cfe2c224244b536 to < db0e50741f0387f388e9ec824ea7ae8456554d5b, f855691975bb06373a98711e4cfe2c224244b536 to < bafa236380816b41b2c4c6970d9067fefa4a6c9e, f855691975bb06373a98711e4cfe2c224244b536 to < 44b3d40967009304617a7a6486490c1d6c12f899, f855691975bb06373a98711e4cfe2c224244b536 to < 0d27567fde5be5f0edc2db5c110142b7915b8fa8, f855691975bb06373a98711e4cfe2c224244b536 to < 86f15300a22656db3fa8c8967defbcd24fac4d37, f855691975bb06373a98711e4cfe2c224244b536 to < 53223f2ed1ef5c90dad814daaaefea4e68a933c8, 3.19—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/da4cbaa75ed088b6d70db77b9103a27e2359e243
git.kernel.orghttps://git.kernel.org/stable/c/db0e50741f0387f388e9ec824ea7ae8456554d5b
git.kernel.orghttps://git.kernel.org/stable/c/bafa236380816b41b2c4c6970d9067fefa4a6c9e
git.kernel.orghttps://git.kernel.org/stable/c/44b3d40967009304617a7a6486490c1d6c12f899
git.kernel.orghttps://git.kernel.org/stable/c/0d27567fde5be5f0edc2db5c110142b7915b8fa8
git.kernel.orghttps://git.kernel.org/stable/c/86f15300a22656db3fa8c8967defbcd24fac4d37
git.kernel.orghttps://git.kernel.org/stable/c/53223f2ed1ef5c90dad814daaaefea4e68a933c8

07 Fixed in

Debian 12

linux
Fixed in 6.1.52-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.4.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.4.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.