High 8.2Published May 27, 2026

CVE-2026-45843slip: bound decode() reads against the compressed packet length

Updated under an hour ago (Oct 26, 2026, 1:40 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: slip: bound decode() reads against the compressed packet length slhc_uncompress() parses a VJ-compressed TCP header by advancing a pointer through the packet via decode() and pull16(). Neither helper bounds-checks against isize, and decode() masks its return with & 0xffff so it can never return the -1 that callers test for -- those error paths are dead code. A short compressed frame whose change byte requests optional fields lets decode() read past the end of the packet. The over-read bytes are folded into the cached cstate and reflected into subsequent reconstructed packets. Make decode() and pull16() take the packet end pointer and return -1 when exhausted. Add a bounds check before the TCP-checksum read. The existing == -1 tests now do what they were always meant to.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-126
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6268f01ae989013671b526c883e92655342c6f6f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9aafba2f49e1fcccc2018816f5836a609c925879; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 335957df4ed60f02a2ec0432fbedbf0cc7241d8b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 37537e42e6df387398bee85cb85070cc80bb1e10; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4cefe32639933d652614b0bd50f818f9af4af78f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d42bec6e4f6d6d658be365539400b3314b76b2a7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 2.6.12; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/6268f01ae989013671b526c883e92655342c6f6f	patch
https://git.kernel.org/stable/c/9aafba2f49e1fcccc2018816f5836a609c925879	patch
https://git.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b	patch
https://git.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10	patch
https://git.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78f	patch
https://git.kernel.org/stable/c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d	patch
https://git.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7	patch
https://git.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.